Support tracking focused node element for OOPIFs.

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index 3177bf6ca70beff1c7d73e8b91e098e67193edf9..47c2f4007d48cc9744e3d8efb3ea16a89e0963f0 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -781,6 +781,9 @@ IPC_MESSAGE_ROUTED1(FrameMsg_SetTextTrackSettings,
 // Posts a message from a frame in another process to the current renderer.
 IPC_MESSAGE_ROUTED1(FrameMsg_PostMessageEvent, FrameMsg_PostMessage_Params)
 
+// Tells the RenderFrame to clear the focused element (if any).
+IPC_MESSAGE_ROUTED0(FrameMsg_ClearFocusedElement)
+
 #if defined(OS_ANDROID)
 // Request the distance to the nearest find result in a frame from the point at
 // (x, y), defined in fractions of the content document's width and height. The
@@ -1119,6 +1122,15 @@ IPC_SYNC_MESSAGE_CONTROL3_1(FrameHostMsg_Are3DAPIsBlocked,
                             content::ThreeDAPIType /* requester */,
                             bool /* blocked */)
 
+// Message sent from renderer to the browser when focus changes inside the
+// frame. The first parameter says whether the newly focused element needs
+// keyboard input (true for textfields, text areas and content editable divs).
+// The second parameter is the node bounds relative to local root's
+// RenderWidgetHostView.
+IPC_MESSAGE_ROUTED2(FrameHostMsg_FocusedNodeChanged,
+                    bool /* is_editable_node */,
+                    gfx::Rect /* node_bounds */)
+
 #if defined(ENABLE_PLUGINS)
 // Notification sent from a renderer to the browser that a Pepper plugin
 // instance is created in the DOM.