Unify Android Webview and Chrome's fling

content/public/browser/android/synchronous_compositor_client.h

Index: content/public/browser/android/synchronous_compositor_client.h
diff --git a/content/public/browser/android/synchronous_compositor_client.h b/content/public/browser/android/synchronous_compositor_client.h
index e42e09aadca15908039b73c1470b72c1e164ee90..83d1e2166a8f545ff476bfe74d2481e3f5f88c53 100644
--- a/content/public/browser/android/synchronous_compositor_client.h
+++ b/content/public/browser/android/synchronous_compositor_client.h
@@ -6,6 +6,8 @@
 #define CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_CLIENT_H_
 
 #include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/time/time.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
@@ -33,7 +35,10 @@ class SynchronousCompositorClient {
                                     float page_scale_factor,
                                     float min_page_scale_factor,
                                     float max_page_scale_factor) = 0;
-  virtual bool IsExternalFlingActive() const = 0;
+  virtual bool IsExternalScrollActive() const = 0;
+
+  typedef base::Callback<void(base::TimeTicks)> AnimationCallback;
+  virtual void SetNeedsAnimateFling(const AnimationCallback& animation) = 0;

[jdduke (slow), 2015/05/18 21:18:34]

If we ever move smooth scrolling to the compositor, would it be helpful to have
a more generic name for this? |SetNeedsAnimateInput| or |SetNeedsAnimateScroll|?

[hush (inactive), 2015/05/19 18:14:59]

Yes. I will rename this function to SetNeedsAnimateScroll.

 
   virtual void DidOverscroll(gfx::Vector2dF accumulated_overscroll,
                              gfx::Vector2dF latest_overscroll_delta,