Add IPC to allow gpu process to send message for console back to renderer

gpu/command_buffer/common/command_buffer.h

 // Copyright (c) 2011 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 GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_
 #define GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_
 
 #include "../common/buffer.h"
 #include "../common/constants.h"
 
@@ skipping 42 matching lines @@
 
     // Lost context detail information.
     error::ContextLostReason context_lost_reason;
 
     // Generation index of this state. The generation index is incremented every
     // time a new state is retrieved from the command processor, so that
     // consistency can be kept even if IPC messages are processed out-of-order.
     uint32 generation;
   };
 
+  struct ConsoleMessage {
+    // An user supplied id.
+    int32 id;
+    // The message.
+    std::string message;
+  };
+
   CommandBuffer() {
   }
 
   virtual ~CommandBuffer() {
   }
 
   // Initialize the command buffer with the given size.
   virtual bool Initialize() = 0;
 
   // Returns the current status.
@@ skipping 54 matching lines @@
   // call this first.
   virtual void SetContextLostReason(error::ContextLostReason) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CommandBuffer);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_