Formalize a RenderFrameHost::AddMessageToConsole() API.

content/public/browser/render_frame_host.h

Index: content/public/browser/render_frame_host.h
diff --git a/content/public/browser/render_frame_host.h b/content/public/browser/render_frame_host.h
index 2b0c5dddeac09fdeec9a943b7ce64519aa5f3a2d..cc02139fe920fe6821d9b29fe0bb5b6c03c8b388 100644
--- a/content/public/browser/render_frame_host.h
+++ b/content/public/browser/render_frame_host.h
@@ -9,6 +9,7 @@
 
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
+#include "content/public/common/console_message_level.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/WebKit/public/platform/WebPageVisibilityState.h"
@@ -67,6 +68,10 @@ class CONTENT_EXPORT RenderFrameHost : public IPC::Listener,
   // Returns the associated widget's native view.
   virtual gfx::NativeView GetNativeView() = 0;
 
+  // Adds |message| to the DevTools console.
+  virtual void AddMessageToConsole(ConsoleMessageLevel level,
+                                   const std::string& message) = 0;
+
   // Runs some JavaScript in this frame's context. If a callback is provided, it
   // will be used to return the result, when the result is available.
   typedef base::Callback<void(const base::Value*)> JavaScriptResultCallback;