add TRACE_EVENT to ANGLE (reland)

Tracing code the same as previous CL:
https://codereview.appspot.com/12699047/

Setup code simplified, and follows the GetProcAddress model of other
gl functions.

R=shannonwoods@google.com
diff --git a/src/libGLESv2/renderer/Renderer.cpp b/src/libGLESv2/renderer/Renderer.cpp
index e045881..69330ae 100644
--- a/src/libGLESv2/renderer/Renderer.cpp
+++ b/src/libGLESv2/renderer/Renderer.cpp
@@ -14,6 +14,7 @@
 #include "libGLESv2/renderer/Renderer9.h"
 #include "libGLESv2/renderer/Renderer11.h"
 #include "common/utilities.h"
+#include "third_party/trace_event/trace_event.h"
 
 #if !defined(ANGLE_ENABLE_D3D11)
 // Enables use of the Direct3D 11 API for a default display, when available
@@ -41,6 +42,7 @@
 
 bool Renderer::initializeCompiler()
 {
+    TRACE_EVENT0("gpu", "initializeCompiler");
 #if defined(ANGLE_PRELOADED_D3DCOMPILER_MODULE_NAMES)
     // Find a D3DCompiler module that had already been loaded based on a predefined list of versions.
     static TCHAR* d3dCompilerNames[] = ANGLE_PRELOADED_D3DCOMPILER_MODULE_NAMES;