[GPU] Add explicit byte order and PM vs. UPM 8888 configs

Review URL: http://codereview.appspot.com/5347042/



git-svn-id: http://skia.googlecode.com/svn/trunk@2618 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/gmmain.cpp b/gm/gmmain.cpp
index f437906..99b1584 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -648,7 +648,7 @@
         gGrContext = GrContext::Create(kOpenGL_Shaders_GrEngine, ctx);
         if (NULL != gGrContext) {
             GrPlatformRenderTargetDesc desc;
-            desc.fConfig = kRGBA_8888_GrPixelConfig;
+            desc.fConfig = kSkia8888_PM_GrPixelConfig;
             desc.fWidth = maxW;
             desc.fHeight = maxH;
             desc.fStencilBits = 8;