Add compile time checks against longs being used in IPC structs on 32 bit Android.

content/public/renderer/render_frame_observer.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_RENDER_FRAME_OBSERVER_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_FRAME_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
@@ skipping 78 matching lines @@
 
   // Called when we receive a console message from Blink for which we requested
   // extra details (like the stack trace). |message| is the error message,
   // |source| is the Blink-reported source of the error (either external or
   // internal), and |stack_trace| is the stack trace of the error in a
   // human-readable format (each frame is formatted as
   // "\n    at function_name (source:line_number:column_number)").
   virtual void DetailedConsoleMessageAdded(const base::string16& message,
                                            const base::string16& source,
                                            const base::string16& stack_trace,
-                                           int32_t line_number,
+                                           uint32_t line_number,
                                            int32_t severity_level) {}
 
   // Called when an interesting (from document lifecycle perspective),
   // compositor-driven layout had happened. This is a reasonable hook to use
   // to inspect the document and layout information, since it is in a clean
   // state and you won't accidentally force new layouts.
   // The interestingness of layouts is explained in WebMeaningfulLayout.h.
   virtual void DidMeaningfulLayout(blink::WebMeaningfulLayout layout_type) {}
 
   // Called when a compositor frame has committed.
@@ skipping 28 matching lines @@
   RenderFrame* render_frame_;
   // The routing ID of the associated RenderFrame.
   int routing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_FRAME_OBSERVER_H_