GPU: Add trace for real SwapBuffers.

ui/gl/gl_surface_egl.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.
 
 // This include must be here so that the includes provided transitively
 // by gl_surface_egl.h don't make it impossible to compile this code.
 #include "third_party/mesa/src/include/GL/osmesa.h"
 
 #include "ui/gl/gl_surface_egl.h"
 
 #if defined(OS_ANDROID)
 #include <android/native_window_jni.h>
 #endif
 
+#include "base/debug/trace_event.h"

[no sievers, 2014/01/14 22:22:18]

nit: order

[epennerAtGoogle, 2014/01/14 22:40:53]

Oy. I figured presubmit was referring to the osmesa. Looks like I was also
wrong!

 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "build/build_config.h"
 #include "ui/gl/egl_util.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_osmesa.h"
 #include "ui/gl/gl_surface_stub.h"
@@ skipping 362 matching lines @@
   }
   return config_;
 #endif
 }
 
 bool NativeViewGLSurfaceEGL::IsOffscreen() {
   return false;
 }
 
 bool NativeViewGLSurfaceEGL::SwapBuffers() {
+  TRACE_EVENT2("gpu", "NativeViewGLSurfaceEGL:RealSwapBuffers",
+      "width", GetSize().width(),
+      "height", GetSize().height());
+
   if (!eglSwapBuffers(GetDisplay(), surface_)) {
     DVLOG(1) << "eglSwapBuffers failed with error "
              << GetLastEGLErrorString();
     return false;
   }
 
   return true;
 }
 
 gfx::Size NativeViewGLSurfaceEGL::GetSize() {
@@ skipping 354 matching lines @@
     }
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 #endif
 
 }  // namespace gfx