Changed the GPU Tracer so the category names can be customized.

gpu/command_buffer/client/gles2_implementation_autogen.h

 // Copyright 2014 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 733 matching lines @@
 void PopulateSubscribedValuesCHROMIUM(GLenum target) override;
 
 void UniformValuebufferCHROMIUM(GLint location,
                                 GLenum target,
                                 GLenum subscription) override;
 
 void BindTexImage2DCHROMIUM(GLenum target, GLint imageId) override;
 
 void ReleaseTexImage2DCHROMIUM(GLenum target, GLint imageId) override;
 
-void TraceBeginCHROMIUM(const char* name) override;
+void TraceBeginCHROMIUM(const char* category_name,
+                        const char* trace_name) override;
 
 void TraceEndCHROMIUM() override;
 
 void AsyncTexSubImage2DCHROMIUM(GLenum target,
                                 GLint level,
                                 GLint xoffset,
                                 GLint yoffset,
                                 GLsizei width,
                                 GLsizei height,
                                 GLenum format,
@@ skipping 40 matching lines @@
                                   GLfloat uv_width,
                                   GLfloat uv_height) override;
 
 void MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) override;
 
 void MatrixLoadIdentityCHROMIUM(GLenum matrixMode) override;
 
 void BlendBarrierKHR() override;
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_AUTOGEN_H_