gpu: Avoid flinging beyond content edge

content/renderer/gpu/input_handler_proxy_unittest.cc

Index: content/renderer/gpu/input_handler_proxy_unittest.cc
diff --git a/content/renderer/gpu/input_handler_proxy_unittest.cc b/content/renderer/gpu/input_handler_proxy_unittest.cc
index 1ab4c04152902a2e556b2ddb2d3d751d035f2b25..14ea2b37dea5fc9db09b988d6d0475360ed7ec52 100644
--- a/content/renderer/gpu/input_handler_proxy_unittest.cc
+++ b/content/renderer/gpu/input_handler_proxy_unittest.cc
@@ -966,5 +966,61 @@ TEST_F(InputHandlerProxyTest, LastInputEventForVSync) {
   EXPECT_EQ(expected_disposition_, input_handler_->HandleInputEvent(gesture_));
 }
 
+TEST_F(InputHandlerProxyTest, GestureFlingStopsAtContentEdge) {
+  // We shouldn't send any events to the widget for this gesture.
+  expected_disposition_ = InputHandlerProxy::DID_HANDLE;
+  VERIFY_AND_RESET_MOCKS();
+
+  // On the fling start, we should schedule an animation but not actually start
+  // scrolling.
+  gesture_.type = WebInputEvent::GestureFlingStart;
+  WebFloatPoint fling_delta = WebFloatPoint(1000, 1000);
+  gesture_.data.flingStart.velocityX = fling_delta.x;
+  gesture_.data.flingStart.velocityY = fling_delta.y;
+  EXPECT_CALL(mock_input_handler_, ScheduleAnimation());
+  EXPECT_CALL(mock_input_handler_, ScrollBegin(testing::_, testing::_))
+      .WillOnce(testing::Return(cc::InputHandler::ScrollStarted));
+  EXPECT_CALL(mock_input_handler_, ScrollEnd());
+  EXPECT_EQ(expected_disposition_, input_handler_->HandleInputEvent(gesture_));
+  testing::Mock::VerifyAndClearExpectations(&mock_input_handler_);
+
+  // The first animate doesn't cause any scrolling.
+  EXPECT_CALL(mock_input_handler_, ScheduleAnimation());
+  base::TimeTicks time = base::TimeTicks() + base::TimeDelta::FromSeconds(10);
+  input_handler_->Animate(time);
+  testing::Mock::VerifyAndClearExpectations(&mock_input_handler_);
+
+  // The second animate starts scrolling in the positive X and Y directions.
+  EXPECT_CALL(mock_input_handler_, ScheduleAnimation());
+  EXPECT_CALL(mock_input_handler_, ScrollBegin(testing::_, testing::_))
+      .WillOnce(testing::Return(cc::InputHandler::ScrollStarted));
+  EXPECT_CALL(mock_input_handler_,
+              ScrollBy(testing::_,
+                       testing::Property(&gfx::Vector2dF::y, testing::Lt(0))))
+      .WillOnce(testing::Return(true));
+  EXPECT_CALL(mock_input_handler_, ScrollEnd());
+  time += base::TimeDelta::FromMilliseconds(100);
+  input_handler_->Animate(time);
+  testing::Mock::VerifyAndClearExpectations(&mock_input_handler_);
+
+  // Simulate hitting the bottom content edge.
+  gfx::Vector2dF overscroll_amount(0, 100);
+  gfx::Vector2dF overscroll_velocity(0, 10);
+  input_handler_->DidOverscroll(overscroll_amount, overscroll_velocity);
+
+  // The next call to animate will no longer scroll vertically.
+  EXPECT_CALL(mock_input_handler_, ScheduleAnimation());
+  EXPECT_CALL(mock_input_handler_, ScrollBegin(testing::_, testing::_))
+      .WillOnce(testing::Return(cc::InputHandler::ScrollStarted));
+  EXPECT_CALL(mock_input_handler_,
+              ScrollBy(testing::_,
+                       testing::Property(&gfx::Vector2dF::y, testing::Eq(0))))
+      .WillOnce(testing::Return(true));
+  EXPECT_CALL(mock_input_handler_, ScrollEnd());
+  time += base::TimeDelta::FromMilliseconds(100);
+  input_handler_->Animate(time);
+  testing::Mock::VerifyAndClearExpectations(&mock_input_handler_);
+}
+
 } // namespace
 } // namespace content