Bug 1367234 - 1. Support fullscreen for e10s GeckoView; r=droeh

Add event listeners and implement basic messages between chrome and
content so let e10s content in GeckoView request/exit fullscreen. Once
we're on the parent side, we still go through the normal fullscreen flow
so there is no platform or Java change involved.

MozReview-Commit-ID: G1tBIOoFqkB

mobile/android/chrome/geckoview/GeckoViewContent.js

@@ -15,10 +15,34 @@ function debug(aMsg) {
 var DOMTitleChangedListener = {
   init: function() {
     addEventListener("DOMTitleChanged", this, false);
+    addEventListener("MozDOMFullscreen:Entered", this, false);
+    addEventListener("MozDOMFullscreen:Exit", this, false);
+    addEventListener("MozDOMFullscreen:Exited", this, false);
+    addEventListener("MozDOMFullscreen:Request", this, false);
+
+    addMessageListener("GeckoView:DOMFullscreenEntered", this);
+    addMessageListener("GeckoView:DOMFullscreenExited", this);
   },
 
   receiveMessage: function(aMsg) {
     debug("receiveMessage " + aMsg.name);
+
+    switch (aMsg.name) {
+      case "GeckoView:DOMFullscreenEntered":
+        if (content) {
+          content.QueryInterface(Ci.nsIInterfaceRequestor)
+                 .getInterface(Ci.nsIDOMWindowUtils)
+                 .handleFullscreenRequests();
+        }
+        break;
+      case "GeckoView:DOMFullscreenExited":
+        if (content) {
+          content.QueryInterface(Ci.nsIInterfaceRequestor)
+                 .getInterface(Ci.nsIDOMWindowUtils)
+                 .exitFullscreen();
+        }
+        break;
+    }
   },
 
   handleEvent: function(aEvent) {
@@ -29,6 +53,21 @@ var DOMTitleChangedListener = {
     debug("handleEvent " + aEvent.type);
 
     switch (aEvent.type) {
+      case "MozDOMFullscreen:Request":
+        sendAsyncMessage("GeckoView:DOMFullscreenRequest");
+        break;
+      case "MozDOMFullscreen:Entered":
+      case "MozDOMFullscreen:Exited":
+        // Content may change fullscreen state by itself, and we should ensure
+        // that the parent always exits fullscreen when content has left
+        // full screen mode.
+        if (content && content.document.fullscreenElement) {
+          break;
+        }
+        // fall-through
+      case "MozDOMFullscreen:Exit":
+        sendAsyncMessage("GeckoView:DOMFullscreenExit");
+        break;
       case "DOMTitleChanged":
         sendAsyncMessage("GeckoView:DOMTitleChanged",
                          { title: content.document.title });

mobile/android/modules/geckoview/GeckoViewContent.jsm

@@ -20,11 +20,30 @@ function debug(aMsg) {
 class GeckoViewContent extends GeckoViewModule {
   init() {
     this.messageManager.loadFrameScript("chrome://geckoview/content/GeckoViewContent.js", true);
+    this.messageManager.addMessageListener("GeckoView:DOMFullscreenExit", this);
+    this.messageManager.addMessageListener("GeckoView:DOMFullscreenRequest", this);
     this.messageManager.addMessageListener("GeckoView:DOMTitleChanged", this);
+
+    this.window.addEventListener("MozDOMFullscreen:Entered", this,
+                                 /* capture */ true, /* untrusted */ false);
+    this.window.addEventListener("MozDOMFullscreen:Exited", this,
+                                 /* capture */ true, /* untrusted */ false);
   }
 
   handleEvent(aEvent) {
     debug("handleEvent: aEvent.type=" + aEvent.type);
+
+    switch (aEvent.type) {
+      case "MozDOMFullscreen:Entered":
+        if (this.browser == aEvent.target) {
+          // Remote browser; dispatch to content process.
+          this.browser.messageManager.sendAsyncMessage("GeckoView:DOMFullscreenEntered");
+        }
+        break;
+      case "MozDOMFullscreen:Exited":
+        this.browser.messageManager.sendAsyncMessage("GeckoView:DOMFullscreenExited");
+        break;
+    }
   }
 
   // Message manager event handler.
@@ -32,6 +51,16 @@ class GeckoViewContent extends GeckoViewModule {
     debug("receiveMessage " + aMsg.name);
 
     switch (aMsg.name) {
+      case "GeckoView:DOMFullscreenExit":
+        this.window.QueryInterface(Ci.nsIInterfaceRequestor)
+                   .getInterface(Ci.nsIDOMWindowUtils)
+                   .remoteFrameFullscreenReverted();
+        break;
+      case "GeckoView:DOMFullscreenRequest":
+        this.window.QueryInterface(Ci.nsIInterfaceRequestor)
+                   .getInterface(Ci.nsIDOMWindowUtils)
+                   .remoteFrameFullscreenChanged(aMsg.target);
+        break;
       case "GeckoView:DOMTitleChanged":
         this.eventDispatcher.sendRequest({
           type: "GeckoView:DOMTitleChanged",