gpu: Avoid integer overflow when setting up client side buffers

gpu/command_buffer/client/vertex_array_object_manager.h

 // Copyright (c) 2012 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_CLIENT_VERTEX_ARRAY_OBJECT_MANAGER_H_
 #define GPU_COMMAND_BUFFER_CLIENT_VERTEX_ARRAY_OBJECT_MANAGER_H_
 
 #include <GLES2/gl2.h>
 #include <stdint.h>
 
@@ skipping 34 matching lines @@
   void GenVertexArrays(GLsizei n, const GLuint* arrays);
 
   // Deletes array objects for the given ids.
   void DeleteVertexArrays(GLsizei n, const GLuint* arrays);
 
   // Binds a vertex array.
   // changed will be set to true if the service should be called.
   // Returns false if array is an unknown id.
   bool BindVertexArray(GLuint array, bool* changed);
 
+  // Whether client side buffers are supported.
+  bool SupportsClientSideBuffers();
+
   // simulated will be set to true if buffers were simulated.
   // Returns true service should be called.
   bool SetupSimulatedClientSideBuffers(
       const char* function_name,
       GLES2Implementation* gl,
       GLES2CmdHelper* gl_helper,
       GLsizei num_elements,
       GLsizei primcount,
       bool* simulated);
 
@@ skipping 58 matching lines @@
   const bool support_client_side_arrays_;
 
   DISALLOW_COPY_AND_ASSIGN(VertexArrayObjectManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_VERTEX_ARRAY_OBJECT_MANAGER_H_