NOT FOR LANDING - [WebView] Allow fling animation via the LayerScrollOffsetDelegate

content/renderer/input/input_handler_proxy.cc

 // Copyright 2013 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 "content/renderer/input/input_handler_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 385 matching lines @@
       // Note that the timestamp will only be used to kickstart the animation if
       // its sufficiently close to the timestamp of the first call |Animate()|.
       has_fling_animation_started_ = false;
       fling_parameters_.startTime = gesture_event.timeStampSeconds;
       fling_parameters_.delta = WebFloatPoint(vx, vy);
       fling_parameters_.point = WebPoint(gesture_event.x, gesture_event.y);
       fling_parameters_.globalPoint =
           WebPoint(gesture_event.globalX, gesture_event.globalY);
       fling_parameters_.modifiers = gesture_event.modifiers;
       fling_parameters_.sourceDevice = gesture_event.sourceDevice;
-      input_handler_->SetNeedsAnimate();
+      input_handler_->SetNeedsAnimateFling();
       return DID_HANDLE;
     }
     case cc::InputHandler::ScrollUnknown:
     case cc::InputHandler::ScrollOnMainThread: {
       TRACE_EVENT_INSTANT0("input",
                            "InputHandlerProxy::HandleGestureFling::"
                            "scroll_on_main_thread",
                            TRACE_EVENT_SCOPE_THREAD);
       fling_may_be_active_on_main_thread_ = true;
       return DID_NOT_HANDLE;
@@ skipping 161 matching lines @@
 
   CancelCurrentFling(true);
 
   if (last_fling_boost_event.type == WebInputEvent::GestureScrollBegin ||
       last_fling_boost_event.type == WebInputEvent::GestureScrollUpdate) {
     // Synthesize a GestureScrollBegin, as the original was suppressed.
     HandleInputEvent(ObtainGestureScrollBegin(last_fling_boost_event));
   }
 }
 
-void InputHandlerProxy::Animate(base::TimeTicks time) {
+void InputHandlerProxy::AnimateFling(base::TimeTicks time) {
   if (!fling_curve_)
     return;
 
   double monotonic_time_sec = InSecondsF(time);
 
   if (deferred_fling_cancel_time_seconds_ &&
       monotonic_time_sec > deferred_fling_cancel_time_seconds_) {
     FlingBoostCancelAndResumeScrollingIfNecessary();
     return;
   }
 
   if (!has_fling_animation_started_) {
     has_fling_animation_started_ = true;
     // Guard against invalid, future or sufficiently stale start times, as there
     // are no guarantees fling event and animation timestamps are compatible.
     if (!fling_parameters_.startTime ||
         monotonic_time_sec <= fling_parameters_.startTime ||
         monotonic_time_sec >= fling_parameters_.startTime +
                                   kMaxSecondsFromFlingTimestampToFirstAnimate) {
       fling_parameters_.startTime = monotonic_time_sec;
-      input_handler_->SetNeedsAnimate();
+      input_handler_->SetNeedsAnimateFling();
       return;
     }
   }
 
   bool fling_is_active =
       fling_curve_->apply(monotonic_time_sec - fling_parameters_.startTime,
                           this);
 
   if (disallow_vertical_fling_scroll_ && disallow_horizontal_fling_scroll_)
     fling_is_active = false;
 
   if (fling_is_active) {
-    input_handler_->SetNeedsAnimate();
+    input_handler_->SetNeedsAnimateFling();
   } else {
     TRACE_EVENT_INSTANT0("input",
                          "InputHandlerProxy::animate::flingOver",
                          TRACE_EVENT_SCOPE_THREAD);
     CancelCurrentFling(true);
   }
 }
 
 void InputHandlerProxy::MainThreadHasStoppedFlinging() {
   fling_may_be_active_on_main_thread_ = false;
@@ skipping 148 matching lines @@
   // trigger a scroll, e.g., with a trivial time delta between fling updates.
   // Return true in this case to prevent early fling termination.
   if (std::abs(clipped_increment.width) < kScrollEpsilon &&
       std::abs(clipped_increment.height) < kScrollEpsilon)
     return true;
 
   return did_scroll;
 }
 
 }  // namespace content