Make EnableViewSourceMode a FrameMsg

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 2465688f7839e122b14e327ac2ef20eb71253ffe..45e3c31a35c82c3ec689f79be6adeba0bf4aea75 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1422,6 +1422,7 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_SerializeAsMHTML, OnSerializeAsMHTML)
     IPC_MESSAGE_HANDLER(FrameMsg_Find, OnFind)
     IPC_MESSAGE_HANDLER(FrameMsg_StopFinding, OnStopFinding)
+    IPC_MESSAGE_HANDLER(FrameMsg_EnableViewSourceMode, OnEnableViewSourceMode)
 #if defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(InputMsg_ActivateNearestFindResult,
                         OnActivateNearestFindResult)
@@ -5093,6 +5094,13 @@ void RenderFrameImpl::OnStopFinding(StopFindAction action) {
   }
 }
 
+void RenderFrameImpl::OnEnableViewSourceMode() {
+  if (!frame_)

[nasko, 2016/03/24 13:55:23]

nit: frame_ should never be invalid except for very narrow period during object
construction.

[clamy, 2016/03/24 14:01:36]

Switched to a DCHECK.

+    return;
+  DCHECK(!frame_->parent());
+  frame_->enableViewSourceMode(true);
+}
+
 #if defined(OS_ANDROID)
 void RenderFrameImpl::OnActivateNearestFindResult(int request_id,
                                                   float x,