Fix BGRA on ES Issue 109.

git-svn-id: http://skia.googlecode.com/svn/trunk@702 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrGLConfig.h b/gpu/include/GrGLConfig.h
index 2bc535d..e21adb7 100644
--- a/gpu/include/GrGLConfig.h
+++ b/gpu/include/GrGLConfig.h
@@ -182,8 +182,8 @@
 // Windows where we match GDI's order).
 #ifndef GR_GL_32BPP_COLOR_FORMAT
     #if GR_WIN32_BUILD
-        #define GR_GL_32BPP_COLOR_FORMAT    GL_BGRA
-    #else 
+        #define GR_GL_32BPP_COLOR_FORMAT    GR_BGRA //use GR prefix because this
+    #else                                           //may be an extension.
         #define GR_GL_32BPP_COLOR_FORMAT    GL_RGBA
     #endif
 #endif
@@ -247,6 +247,10 @@
 };
 }
 
+// BGRA format
+
+#define GR_BGRA                     0x80E1
+
 // FBO
 #define GR_FRAMEBUFFER              0x8D40
 #define GR_FRAMEBUFFER_COMPLETE     0x8CD5