Implement windows mousewheel scroll by page functionality

webkit/compositor_bindings/web_to_ccinput_handler_adapter.cc

 // Copyright 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.
 
 #include "webkit/compositor_bindings/web_to_ccinput_handler_adapter.h"
 
 #include "third_party/WebKit/Source/Platform/chromium/public/WebInputHandlerClient.h"
 
 #define COMPILE_ASSERT_MATCHING_ENUM(webkit_name, cc_name) \
   COMPILE_ASSERT(static_cast<int>(WebKit::webkit_name) ==  \
@@ skipping 34 matching lines @@
   virtual ScrollStatus scrollBegin(WebPoint point, ScrollInputType type) {
     return static_cast<WebInputHandlerClient::ScrollStatus>(
         client_->ScrollBegin(
             point, static_cast<cc::InputHandlerClient::ScrollInputType>(type)));
   }
 
   virtual bool scrollByIfPossible(WebPoint point, WebFloatSize delta) {
     return client_->ScrollBy(point, delta);
   }
 
+  virtual bool scrollVerticallyByPageIfPossible(
+      WebPoint point, WebScrollbar::ScrollDirection direction) {
+    return client_->ScrollVerticallyByPage(point, direction);
+  }
+
   virtual void scrollEnd() { client_->ScrollEnd(); }
 
   virtual void pinchGestureBegin() { client_->PinchGestureBegin(); }
 
   virtual void pinchGestureUpdate(float magnify_delta, WebPoint anchor) {
     client_->PinchGestureUpdate(magnify_delta, anchor);
   }
 
   virtual void pinchGestureEnd() { client_->PinchGestureEnd(); }
 
@@ skipping 28 matching lines @@
 void WebToCCInputHandlerAdapter::Animate(base::TimeTicks time) {
   double monotonic_time_seconds = (time - base::TimeTicks()).InSecondsF();
   handler_->animate(monotonic_time_seconds);
 }
 
 void WebToCCInputHandlerAdapter::MainThreadHasStoppedFlinging() {
   handler_->mainThreadHasStoppedFlinging();
 }
 
 }  // namespace WebKit