Add TRACE calls for all gpu driver calls

ui/gl/gl_gl_api_implementation.cc

 // 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.
 
 #include "ui/gl/gl_gl_api_implementation.h"
 
 #include <algorithm>
 #include <vector>
 
+#include "base/command_line.h"
 #include "base/string_util.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_state_restorer.h"
 #include "ui/gl/gl_surface.h"
+#include "ui/gl/gl_switches.h"
 
 namespace gfx {
 
-RealGLApi* g_real_gl;
+// The GL Api being used. This could be g_real_gl or gl_trace_gl
+static GLApi* g_gl;
+// A GL Api that calls directly into the driver.
+static RealGLApi* g_real_gl;
+// A GL Api that calls TRACE and then calls another GL api.
+static TraceGLApi* g_trace_gl;
 
 void InitializeGLBindingsGL() {
   g_driver_gl.InitializeBindings();
   if (!g_real_gl) {
     g_real_gl = new RealGLApi();
+    g_trace_gl = new TraceGLApi(g_real_gl);
   }
   g_real_gl->Initialize(&g_driver_gl);
+  g_gl = g_real_gl;
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableGPUServiceTracing)) {
+    g_gl = g_trace_gl;
+  }
   SetGLToRealGLApi();
 }
 
 GLApi* GetCurrentGLApi() {
   return g_current_gl_context;
 }
 
 void SetGLApi(GLApi* api) {
   g_current_gl_context = api;
 }
 
 void SetGLToRealGLApi() {
-  SetGLApi(g_real_gl);
+  SetGLApi(g_gl);
 }
 
 void InitializeGLExtensionBindingsGL(GLContext* context) {
   g_driver_gl.InitializeExtensionBindings(context);
 }
 
 void InitializeDebugGLBindingsGL() {
   g_driver_gl.InitializeDebugBindings();
 }
 
 void ClearGLBindingsGL() {
   if (g_real_gl) {
     delete g_real_gl;
     g_real_gl = NULL;
   }
+  if (g_trace_gl) {
+    delete g_trace_gl;
+    g_trace_gl = NULL;
+  }
+  g_gl = NULL;
   g_current_gl_context = NULL;
   g_driver_gl.ClearBindings();
 }
 
 GLApi::GLApi() {
 }
 
 GLApi::~GLApi() {
 }
 
@@ skipping 11 matching lines @@
 RealGLApi::RealGLApi() {
 }
 
 RealGLApi::~RealGLApi() {
 }
 
 void RealGLApi::Initialize(DriverGL* driver) {
   InitializeBase(driver);
 }
 
+TraceGLApi::~TraceGLApi() {
+}
+
 VirtualGLApi::VirtualGLApi()
     : real_context_(NULL),
       current_context_(NULL) {
 }
 
 VirtualGLApi::~VirtualGLApi() {
 }
 
 void VirtualGLApi::Initialize(DriverGL* driver, GLContext* real_context) {
   InitializeBase(driver);
@@ skipping 66 matching lines @@
 const GLubyte* VirtualGLApi::glGetStringFn(GLenum name) {
   switch (name) {
     case GL_EXTENSIONS:
       return reinterpret_cast<const GLubyte*>(extensions_.c_str());
     default:
       return driver_->fn.glGetStringFn(name);
   }
 }
 
 }  // namespace gfx