Use inner HWND for accelerated rendering on windows

app/gfx/gl/gl_context_win.cc

Index: app/gfx/gl/gl_context_win.cc
===================================================================
--- app/gfx/gl/gl_context_win.cc	(revision 66799)
+++ app/gfx/gl/gl_context_win.cc	(working copy)
@@ -50,6 +50,7 @@
   virtual bool IsCurrent();
   virtual bool IsOffscreen();
   virtual bool SwapBuffers();
+  virtual void SetSize(gfx::Size);
   virtual gfx::Size GetSize();
   virtual void* GetHandle();
   virtual void SetSwapInterval(int interval);
@@ -82,6 +83,7 @@
   virtual bool IsCurrent();
   virtual bool IsOffscreen();
   virtual bool SwapBuffers();
+  virtual void SetSize(gfx::Size);
   virtual gfx::Size GetSize();
   virtual void* GetHandle();
   virtual void SetSwapInterval(int interval);
@@ -411,6 +413,12 @@
   return ::SwapBuffers(device_context_) == TRUE;
 }
 
+void NativeViewGLContext::SetSize(gfx::Size size) {
+  UINT swp_flags = SWP_NOSENDCHANGING | SWP_NOOWNERZORDER | SWP_NOCOPYBITS |
+    SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_DEFERERASE;
+  SetWindowPos(window_, NULL, 0, 0, size.width(), size.height(), swp_flags);
+}
+
 gfx::Size NativeViewGLContext::GetSize() {
   RECT rect;
   CHECK(GetClientRect(window_, &rect));
@@ -527,6 +535,14 @@
   // but GDI does not have those semantics.
 }
 
+void OSMesaViewGLContext::SetSize(gfx::Size size) {
+  UINT swp_flags = SWP_NOSENDCHANGING | SWP_NOOWNERZORDER | SWP_NOCOPYBITS |
+    SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_DEFERERASE;
+  SetWindowPos(window_, NULL, 0, 0, size.width(), size.height(), swp_flags);
+  UpdateSize();
+}
+
+
 void OSMesaViewGLContext::UpdateSize() {
   // Change back buffer size to that of window. If window handle is invalid, do
   // not change the back buffer size.