Mac ÜC: Make resize smooth

content/browser/compositor/browser_compositor_view_mac.h

Index: content/browser/compositor/browser_compositor_view_mac.h
diff --git a/content/browser/compositor/browser_compositor_view_mac.h b/content/browser/compositor/browser_compositor_view_mac.h
index 0dc358bbe79a980fb84f0fe9ffe16378dc3db93d..49ac4dd2abcda287d71870b3bef668985ba238af 100644
--- a/content/browser/compositor/browser_compositor_view_mac.h
+++ b/content/browser/compositor/browser_compositor_view_mac.h
@@ -52,6 +52,12 @@ class BrowserCompositorViewMacClient {
 
   // Used to install the root ui::Layer into the ui::Compositor.
   virtual ui::Layer* BrowserCompositorRootLayer() = 0;
+
+  // If this returns true, then frames will be drawn immediately when they are
+  // received, instead of waiting for the CAOpenGLLayer's callback. This helps
+  // de-jank resize, because said callback can't come through while pumping for
+  // resized frames.
+  virtual bool BrowserCompositorShouldDrawImmediately() = 0;
 };
 
 // The class to hold a ui::Compositor-backed NSView. Because a ui::Compositor
@@ -66,9 +72,15 @@ class BrowserCompositorViewMac {
   explicit BrowserCompositorViewMac(BrowserCompositorViewMacClient* client);
   ~BrowserCompositorViewMac();
 
+  // The NSView set at the sub-view for this view.
+  NSView* GetView() const;
+
   // The ui::Compositor being used to render the NSView.
   ui::Compositor* GetCompositor() const;
 
+  // Check if a frame of the correct size is currently being displayed.
+  bool HasFrameWithSizeInDIP(const gfx::Size& desired_size_in_dip) const;
+
   // The client (used by the BrowserCompositorViewCocoa to access the client).
   BrowserCompositorViewMacClient* GetClient() const { return client_; }