Hooking MHTML generation to the browser.

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 2554b2843cbd94a893d1d673340fa2052001a62d..762b93046644444a972a2b3392a3e15ec8932976 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -1195,6 +1195,11 @@ IPC_MESSAGE_ROUTED0(ViewMsg_GetFPS)
 // Used to instruct the RenderView to go into "view source" mode.
 IPC_MESSAGE_ROUTED0(ViewMsg_EnableViewSourceMode)
 
+// Instructs the renderer to save the current page to MHTML.
+IPC_MESSAGE_ROUTED2(ViewMsg_SavePageAsMHTML,
+                    int /* job_id */,
+                    IPC::PlatformFileForTransit /* file handle */)
+
 // Messages sent from the renderer to the browser.
 
 // Sent by the renderer when it is creating a new window.  The browser creates
@@ -1963,3 +1968,7 @@ IPC_MESSAGE_CONTROL2(ViewHostMsg_FPS,
                      int /* routing id */,
                      float /* frames per second */)
 
+// Notifies the browser that the page was or was not saved as MHTML.
+IPC_MESSAGE_ROUTED2(ViewHostMsg_SavedPageAsMHTML,
+                    int /* job_id*/,
+                    bool /* success */)