Adding status to swap complete

ui/gl/gl_surface_win.cc

Index: ui/gl/gl_surface_win.cc
diff --git a/ui/gl/gl_surface_win.cc b/ui/gl/gl_surface_win.cc
index 8d55009a0efc0662c4d4c43d2254fa307c1b2f2e..aa15880a5600d5a7cd0c434bb3ee8e81600bacbc 100644
--- a/ui/gl/gl_surface_win.cc
+++ b/ui/gl/gl_surface_win.cc
@@ -39,8 +39,8 @@ class NativeViewGLSurfaceOSMesa : public GLSurfaceOSMesa {
   bool Initialize() override;
   void Destroy() override;
   bool IsOffscreen() override;
-  bool SwapBuffers() override;
-  bool SupportsPostSubBuffer() override;
+  gfx::SwapResult SwapBuffers() override;
+  gfx::SwapResult SupportsPostSubBuffer() override;
   bool PostSubBuffer(int x, int y, int width, int height) override;
 
  private:
@@ -190,7 +190,7 @@ bool NativeViewGLSurfaceOSMesa::IsOffscreen() {
   return false;
 }
 
-bool NativeViewGLSurfaceOSMesa::SwapBuffers() {
+gfx::SwapResult NativeViewGLSurfaceOSMesa::SwapBuffers() {
   DCHECK(device_context_);
 
   gfx::Size size = GetSize();
@@ -223,15 +223,17 @@ bool NativeViewGLSurfaceOSMesa::SwapBuffers() {
                 DIB_RGB_COLORS,
                 SRCCOPY);
 
-  return true;
+  return gfx::SwapResult::SWAP_ACK;
 }
 
 bool NativeViewGLSurfaceOSMesa::SupportsPostSubBuffer() {
   return true;
 }
 
-bool NativeViewGLSurfaceOSMesa::PostSubBuffer(
-    int x, int y, int width, int height) {
+gfx::SwapResult NativeViewGLSurfaceOSMesa::PostSubBuffer(int x,
+                                                         int y,
+                                                         int width,
+                                                         int height) {
   DCHECK(device_context_);
 
   gfx::Size size = GetSize();
@@ -264,7 +266,7 @@ bool NativeViewGLSurfaceOSMesa::PostSubBuffer(
                 DIB_RGB_COLORS,
                 SRCCOPY);
 
-  return true;
+  return gfx::SwapResult::SWAP_ACK;
 }
 
 scoped_refptr<GLSurface> GLSurface::CreateViewGLSurface(