Upstream android's fling animator.

webkit/glue/fling_animator_impl_android.h

Index: webkit/glue/fling_animator_impl_android.h
===================================================================
--- webkit/glue/fling_animator_impl_android.h	(revision 0)
+++ webkit/glue/fling_animator_impl_android.h	(working copy)
@@ -0,0 +1,44 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WEBKIT_GLUE_FLING_ANIMATOR_IMPL_ANDROID_H_
+#define WEBKIT_GLUE_FLING_ANIMATOR_IMPL_ANDROID_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebFlingAnimator.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebFloatPoint.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebPoint.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebRect.h"
+
+namespace webkit_glue {
+
+class FlingAnimatorImpl : public WebKit::WebFlingAnimator {
+ public:
+  FlingAnimatorImpl();
+  virtual ~FlingAnimatorImpl();
+
+  virtual void startFling(const WebKit::WebFloatPoint& velocity,
+                          const WebKit::WebRect& range);
+  // Returns true if the animation is not yet finished.
+  virtual bool updatePosition();
+  virtual WebKit::WebPoint getCurrentPosition();
+  virtual void cancelFling();
+
+ private:
+  bool is_active_;
+
+  // Java OverScroller instance and methods.
+  base::android::ScopedJavaGlobalRef<jobject> java_scroller_;
+  jmethodID fling_method_id_;
+  jmethodID abort_method_id_;
+  jmethodID compute_method_id_;
+  jmethodID getX_method_id_;
+  jmethodID getY_method_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(FlingAnimatorImpl);
+};
+
+} // namespace webkit_glue
+
+#endif // WEBKIT_GLUE_FLING_ANIMATOR_IMPL_ANDROID_H_