Bug 600763. Force initialization of OpenGL on OS X. r,a=joe

This is expected to regress Ts but the idea is to separate
out the costs that we have little control of (like this one)
from the costs that we have more control of.

gfx/thebes/gfxPlatformMac.cpp

@@ -36,6 +36,8 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#include <OpenGL/OpenGL.h>
+
 #include "gfxPlatformMac.h"
 
 #include "gfxImageSurface.h"
@@ -57,10 +59,34 @@
 
 #include "qcms.h"
 
+static void forceGLInit()
+{
+    CGLPixelFormatAttribute attribs[] =
+    {
+        kCGLPFAAccelerated,
+        kCGLPFAColorSize, (CGLPixelFormatAttribute)24,
+        kCGLPFADepthSize, (CGLPixelFormatAttribute)16,
+        kCGLPFADoubleBuffer,
+        kCGLPFASupersample,
+        (CGLPixelFormatAttribute)0
+    };
+
+    CGLPixelFormatObj pixelFormatObj;
+    GLint numPixelFormats;
+
+    CGLChoosePixelFormat (attribs, &pixelFormatObj, &numPixelFormats);
+}
+
+
 gfxPlatformMac::gfxPlatformMac()
 {
     mOSXVersion = 0;
     mFontAntiAliasingThreshold = ReadAntiAliasingThreshold();
+
+    /* We'll force the initialization of GL unconditionally so that we'll see
+       the impact on Ts. Eventually, we should be able to do this on another
+       thread bringing the cost down */
+    forceGLInit();
 }
 
 gfxPlatformMac::~gfxPlatformMac()