Fix page zoom to be frame-centric for out-of-process frames.

content/common/frame_messages.h

 // Copyright 2013 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 interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 772 matching lines @@
 IPC_MESSAGE_ROUTED0(FrameMsg_SetFocusedFrame)
 
 // Send to the RenderFrame to set text tracks state and style settings.
 // Sent for top-level frames.
 IPC_MESSAGE_ROUTED1(FrameMsg_SetTextTrackSettings,
                     FrameMsg_TextTrackSettings_Params /* params */)
 
 // Posts a message from a frame in another process to the current renderer.
 IPC_MESSAGE_ROUTED1(FrameMsg_PostMessageEvent, FrameMsg_PostMessage_Params)
 
+// Instructs the frame to set its zoom level to match the owning WebContents.

[alexmos, 2016/04/05 18:00:54]

The comments for these two messages are the same - might want to explain what
the difference is.

[wjmaclean, 2016/04/05 20:22:00]

Done.

[alexmos, 2016/04/07 01:20:56]

They're still the same in the latest PS :)

[wjmaclean, 2016/04/07 12:55:36]

Ooops. No matter, as these messages go away in the next patch.

+IPC_MESSAGE_ROUTED2(FrameMsg_SetTemporaryZoomLevel,
+                    double /* zoom_level*/,
+                    bool /* is_temporary */)
+
+// Instructs the frame to set its zoom level to match the owning WebContents.
+IPC_MESSAGE_ROUTED1(FrameMsg_SetZoomLevelFromWebContents,
+                    double /* zoom_level*/)
+
 #if defined(OS_ANDROID)
 // Sent when the browser wants the bounding boxes of the current find matches.
 //
 // If match rects are already cached on the browser side, |current_version|
 // should be the version number from the FrameHostMsg_FindMatchRects_Reply
 // they came in, so the renderer can tell if it needs to send updated rects.
 // Otherwise just pass -1 to always receive the list of rects.
 //
 // There must be an active search string (it is probably most useful to call
 // this immediately after a FrameHostMsg_Find_Reply message arrives with
@@ skipping 654 matching lines @@
 IPC_MESSAGE_ROUTED3(FrameHostMsg_FindMatchRects_Reply,
                     int /* version */,
                     std::vector<gfx::RectF> /* rects */,
                     gfx::RectF /* active_rect */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.