Support fullscreen for non-video elements in the WebView.

content/common/view_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 1577 matching lines @@
 // to be be delivered until the notification is disabled.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_SetNeedsBeginFrame,
                     bool /* enabled */)
 
 // Reply to the ViewMsg_ExtractSmartClipData message.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_SmartClipDataExtracted,
                     base::string16 /* text */,
                     base::string16 /* html */,
                     gfx::Rect /* rect */)
 
+// Messages sent from the renderer to the browser after the page has been
+// bound into / out of fullscreen. In the case of video only at this point

[Tom Sepez, 2014/10/02 17:28:59]

I don't understand the sentence "In the case of video ..." 

[Ignacio Solla, 2014/10/03 09:45:20]

Removed the second sentence, as it is just too verbose.

+// will the ContentVideoView have been created, which the browser is
+// responsible of showing.
+IPC_MESSAGE_ROUTED0(ViewHostMsg_DidEnterFullscreen)
+IPC_MESSAGE_ROUTED0(ViewHostMsg_DidExitFullscreen)
+
 #elif defined(OS_MACOSX)
 // Request that the browser load a font into shared memory for us.
 IPC_SYNC_MESSAGE_CONTROL1_3(ViewHostMsg_LoadFont,
                            FontDescriptor /* font to load */,
                            uint32 /* buffer size */,
                            base::SharedMemoryHandle /* font data */,
                            uint32 /* font id */)
 
 // Informs the browser that a plugin has gained or lost focus.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_PluginFocusChanged,
@@ skipping 32 matching lines @@
 // Since the browser keeps handles to the allocated transport DIBs, this
 // message is sent to tell the browser that it may release them when the
 // renderer is finished with them.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_FreeTransportDIB,
                      TransportDIB::Id /* DIB id */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.