skia: add ability to load command_buffer_gles2

include/views/SkOSWindow_Win.h

Index: include/views/SkOSWindow_Win.h
diff --git a/include/views/SkOSWindow_Win.h b/include/views/SkOSWindow_Win.h
index ccab59066dd57bb3bdb58a58899d81cf8dbb39a7..753dcd36a7de9b68c71284624f7f801307eec7d1 100644
--- a/include/views/SkOSWindow_Win.h
+++ b/include/views/SkOSWindow_Win.h
@@ -37,6 +37,9 @@ public:
 #if SK_ANGLE
         kANGLE_BackEndType,
 #endif // SK_ANGLE
+#if SK_COMMAND_BUFFER
+        kCommandBuffer_BackEndType,
+#endif // SK_COMMAND_BUFFER
 #endif // SK_SUPPORT_GPU
     };
 
@@ -90,12 +93,12 @@ private:
 
 #if SK_SUPPORT_GPU
     void*               fHGLRC;
-#if SK_ANGLE
+#if SK_ANGLE || SK_COMMAND_BUFFER
     EGLDisplay          fDisplay;
     EGLContext          fContext;
     EGLSurface          fSurface;
     EGLConfig           fConfig;
-#endif // SK_ANGLE
+#endif // SK_ANGLE || SK_COMMAND_BUFFER
 #endif // SK_SUPPORT_GPU
 
     bool                fFullscreen;
@@ -125,6 +128,12 @@ private:
     void detachANGLE();
     void presentANGLE();
 #endif // SK_ANGLE
+
+#if SK_COMMAND_BUFFER
+    bool attachCommandBuffer(int msaaSampleCount, AttachmentInfo* info);
+    void detachCommandBuffer();
+    void presentCommandBuffer();
+#endif // SK_COMMAND_BUFFER
 #endif // SK_SUPPORT_GPU
 
     typedef SkWindow INHERITED;