Developer switch for enabling experimental multi-e10s (#3022)

Author: bluemarvin

app/src/common/shared/org/mozilla/vrbrowser/browser/SettingsStore.java

@@ -84,6 +84,7 @@ SettingsStore getInstance(final @NonNull Context aContext) {
     public final static long FXA_LAST_SYNC_NEVER = 0;
     public final static boolean RESTORE_TABS_ENABLED = true;
     public final static boolean BYPASS_CACHE_ON_RELOAD = false;
+    public final static boolean MULTI_E10S = false;
 
     // Enable telemetry by default (opt-out).
     public final static boolean CRASH_REPORTING_DEFAULT = false;
@@ -666,12 +667,22 @@ public boolean isRestoreTabsEnabled() {
 
     public void setBypassCacheOnReload(boolean isEnabled) {
         SharedPreferences.Editor editor = mPrefs.edit();
-        editor.putBoolean(mContext.getString(R.string.settings_key_bypass_cache_on_reload),isEnabled);
+        editor.putBoolean(mContext.getString(R.string.settings_key_bypass_cache_on_reload), isEnabled);
         editor.commit();
     }
 
     public boolean isBypassCacheOnReloadEnabled() {
         return mPrefs.getBoolean(mContext.getString(R.string.settings_key_bypass_cache_on_reload), BYPASS_CACHE_ON_RELOAD);
     }
+
+    public void setMultiE10s(boolean isEnabled) {
+        SharedPreferences.Editor editor = mPrefs.edit();
+        editor.putBoolean(mContext.getString(R.string.settings_key_multi_e10s), isEnabled);
+        editor.commit();
+    }
+
+    public boolean isMultiE10s() {
+        return mPrefs.getBoolean(mContext.getString(R.string.settings_key_multi_e10s), MULTI_E10S);
+    }
 }
 

app/src/common/shared/org/mozilla/vrbrowser/browser/engine/SessionUtils.java

@@ -43,6 +43,8 @@ public static void vrPrefsWorkAround(Context aContext, Bundle aExtras) {
             // Disable WebRender until it works with FxR
             out.write("pref(\"gfx.webrender.force-disabled\", true);\n".getBytes());
             out.write("pref(\"signon.rememberSignons\", false);\n".getBytes());
+            int processCount = SettingsStore.getInstance(aContext).isMultiE10s() ? 3 : 1;
+            out.write(("pref(\"dom.ipc.processCount\", " +  processCount + ");\n").getBytes());
             int msaa = SettingsStore.getInstance(aContext).getMSAALevel();
             if (msaa > 0) {
                 int msaaLevel = msaa == 2 ? 4 : 2;

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/settings/DeveloperOptionsView.java

@@ -69,6 +69,9 @@ protected void updateUI() {
         mBinding.bypassCacheOnReloadSwitch.setOnCheckedChangeListener(mBypassCacheOnReloadListener);
         setBypassCacheOnReload(SettingsStore.getInstance(getContext()).isBypassCacheOnReloadEnabled(), false);
 
+        mBinding.multiE10sSwitch.setOnCheckedChangeListener(mMultiE10sListener);
+        setMultiE10s(SettingsStore.getInstance(getContext()).isMultiE10s(), false);
+
         if (BuildConfig.DEBUG) {
             mBinding.debugLoggingSwitch.setVisibility(View.GONE);
         } else {
@@ -108,6 +111,10 @@ protected void updateUI() {
         setBypassCacheOnReload(value, doApply);
     };
 
+    private SwitchSetting.OnCheckedChangeListener mMultiE10sListener = (compundButton, value, doApply) -> {
+        setMultiE10s(value, doApply);
+    };
+
     private SwitchSetting.OnCheckedChangeListener mServoListener = (compoundButton, b, doApply) -> {
         setServo(b, true);
     };
@@ -215,6 +222,17 @@ private void setBypassCacheOnReload(boolean value, boolean doApply) {
         }
     }
 
+    private void setMultiE10s(boolean value, boolean doApply) {
+        mBinding.multiE10sSwitch.setOnCheckedChangeListener(null);
+        mBinding.multiE10sSwitch.setValue(value, false);
+        mBinding.multiE10sSwitch.setOnCheckedChangeListener(mMultiE10sListener);
+
+        if (doApply) {
+            SettingsStore.getInstance(getContext()).setMultiE10s(value);
+            showRestartDialog();
+        }
+    }
+
     private void setServo(boolean value, boolean doApply) {
         mBinding.servoSwitch.setOnCheckedChangeListener(null);
         mBinding.servoSwitch.setValue(value, false);

app/src/main/res/layout/options_developer.xml

@@ -73,6 +73,12 @@
                     android:layout_height="wrap_content"
                     app:description="@string/bypass_cache_on_reload_switch" />
 
+                <org.mozilla.vrbrowser.ui.views.settings.SwitchSetting
+                    android:id="@+id/multi_e10s_switch"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    app:description="@string/multi_e10s_switch" />
+
                 <org.mozilla.vrbrowser.ui.views.settings.SwitchSetting
                     android:id="@+id/servo_switch"
                     android:layout_width="match_parent"

app/src/main/res/values/non_L10n.xml

@@ -51,6 +51,7 @@
     <string name="settings_key_fxa_last_sync" translatable="false">settings_key_fxa_last_sync</string>
     <string name="settings_key_restore_tabs" translatable="false">settings_key_restore_tabs</string>
     <string name="settings_key_bypass_cache_on_reload" translatable="false">settings_key_bypass_cache_on_reload</string>
+    <string name="settings_key_multi_e10s" translatable="false">settings_key_multi_e10s</string>
     <string name="environment_override_help_url" translatable="false">https://github.com/MozillaReality/FirefoxReality/wiki/Environments</string>
     <string name="private_policy_url" translatable="false">https://www.mozilla.org/privacy/firefox/</string>
     <string name="private_report_url" translatable="false">https://mixedreality.mozilla.org/fxr/report?src=browser-fxr&amp;label=browser-firefox-reality&amp;url=%1$s</string>

app/src/main/res/values/strings.xml

@@ -367,6 +367,12 @@
     -->
     <string name="bypass_cache_on_reload_switch">Enable Cache Bypass On Reload</string>
 
+    <!-- This string labels an On/Off switch in the developer options dialog and is used to toggle
+         Multi-e10s. Multi-e10s allocates a process for each open window instead of having only one
+         process for all windows.
+    -->
+    <string name="multi_e10s_switch">Enable Multi-e10s</string>
+
     <!-- The string labels an On/Off switch in the developer options dialog and is used to toggle enabling Servo. -->
     <string name="developer_options_servo">Enable Servo</string>