[Experimental] Supporting OOPIF printing

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 302538e1a616576e1ee979a39b7be9d6b0efffca..f9e9e9a8677697dccb2e472f8baea27a21d8bc7e 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -948,6 +948,10 @@ IPC_MESSAGE_ROUTED0(FrameMsg_SetHasReceivedUserGesture)
 IPC_MESSAGE_ROUTED1(FrameMsg_RunFileChooserResponse,
                     std::vector<content::FileChooserFileInfo>)
 
+IPC_MESSAGE_ROUTED2(FrameMsg_PrintFrame,
+                    gfx::Rect, /* print area */
+                    int /* root frame id */)
+
 // -----------------------------------------------------------------------------
 // Messages sent from the renderer to the browser.
 
@@ -1539,6 +1543,10 @@ IPC_MESSAGE_ROUTED1(FrameHostMsg_HittestData, FrameHostMsg_HittestData_Params)
 // FrameMsg_RunFileChooserResponse message.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_RunFileChooser, content::FileChooserParams)
 
+// Tells the parent that a child's frame, which is a remote frame, needs to
+// be printed.
+IPC_MESSAGE_ROUTED2(FrameHostMsg_PrintRemoteFrame, gfx::Rect /* size */, int)
+
 #if defined(USE_EXTERNAL_POPUP_MENU)
 
 // Message to show/hide a popup menu using native controls.