gpu: Avoid integer overflow when setting up client side buffers

gpu/command_buffer/client/vertex_array_object_manager.h

Index: gpu/command_buffer/client/vertex_array_object_manager.h
diff --git a/gpu/command_buffer/client/vertex_array_object_manager.h b/gpu/command_buffer/client/vertex_array_object_manager.h
index 42ec269ea51224f88cef0537c36791ca73e0c457..9efac4c3c14d5c9df96785ebdeec4f6fa0b5ee3f 100644
--- a/gpu/command_buffer/client/vertex_array_object_manager.h
+++ b/gpu/command_buffer/client/vertex_array_object_manager.h
@@ -52,6 +52,9 @@ class GLES2_IMPL_EXPORT VertexArrayObjectManager {
   // 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(