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..b65d4c29dfb18efa3845a9cae63c5f6dd9f7f8c7 100644
--- a/include/views/SkOSWindow_Win.h
+++ b/include/views/SkOSWindow_Win.h
@@ -18,6 +18,10 @@
 #include "EGL/egl.h"
 #endif
 
+#if SK_COMMAND_BUFFER
+class SkCommandBufferGLContext;
+#endif
+
 class SkOSWindow : public SkWindow {
 public:
     struct WindowInit {
@@ -37,6 +41,9 @@ public:
 #if SK_ANGLE
         kANGLE_BackEndType,
 #endif // SK_ANGLE
+#if SK_COMMAND_BUFFER
+        kCommandBuffer_BackEndType,
+#endif // SK_COMMAND_BUFFER
 #endif // SK_SUPPORT_GPU
     };
 
@@ -96,6 +103,9 @@ private:
     EGLSurface          fSurface;
     EGLConfig           fConfig;
 #endif // SK_ANGLE
+#if SK_COMMAND_BUFFER
+    SkCommandBufferGLContext* fCommandBuffer;
+#endif // SK_COMMAND_BUFFER
 #endif // SK_SUPPORT_GPU
 
     bool                fFullscreen;
@@ -125,6 +135,12 @@ 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;