Revert of remove workaround for dx9 angle slow rgba pixel ops

include/gpu/gl/GrGLConfig_chrome.h

Index: include/gpu/gl/GrGLConfig_chrome.h
diff --git a/include/gpu/gl/GrGLConfig_chrome.h b/include/gpu/gl/GrGLConfig_chrome.h
index b4776ab9345e0eeac00b673925affcf9746a10cb..ee875b7f22e049aaa3ddcb0c021febc8890b51b1 100644
--- a/include/gpu/gl/GrGLConfig_chrome.h
+++ b/include/gpu/gl/GrGLConfig_chrome.h
@@ -12,9 +12,13 @@
 #define GR_GL_CHECK_ERROR_START                     0
 
 #if defined(SK_BUILD_FOR_WIN32)
+// For RGBA teximage/readpixels ANGLE will sw-convert to/from BGRA.
+#define GR_GL_RGBA_8888_PIXEL_OPS_SLOW              1
+
 // ANGLE can go faster if the entire fbo is read rather than a subrect
 #define GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL   1
 #else
+#define GR_GL_RGBA_8888_PIXEL_OPS_SLOW              0
 #define GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL   0
 #endif
 
@@ -39,4 +43,8 @@
 // (const char* const instead of char**).
 #define GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE       1
 
+#if !defined(GR_GL_IGNORE_ES3_MSAA)
+    #define GR_GL_IGNORE_ES3_MSAA 1
 #endif
+
+#endif