OverscrollController consumes scroll updates only during gesture-nav.

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

Index: content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
index e7fc95b880ea7c7a1ce10fe67a132a0779a9782f..506b02e6722a184380a15963428ecd5a137d7dde 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
@@ -123,9 +123,10 @@ class TestOverscrollDelegate : public OverscrollControllerDelegate {
     return view_->IsShowing() ? view_->GetViewBounds() : gfx::Rect();
   }
 
-  virtual void OnOverscrollUpdate(float delta_x, float delta_y) OVERRIDE {
+  virtual bool OnOverscrollUpdate(float delta_x, float delta_y) OVERRIDE {
     delta_x_ = delta_x;
     delta_y_ = delta_y;
+    return true;
   }
 
   virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) OVERRIDE {
@@ -2534,9 +2535,10 @@ TEST_F(RenderWidgetHostViewAuraOverscrollTest, OverscrollDirectionChange) {
   EXPECT_EQ(0U, sink_->message_count());
 
   // Send another update event, but in the reverse direction. The overscroll
-  // controller will consume the event, and reset the overscroll mode.
+  // controller will not consume the event, because it is not triggering
+  // gesture-nav.
   SimulateGestureScrollUpdateEvent(-260, 0, 0);
-  EXPECT_EQ(0U, sink_->message_count());
+  EXPECT_EQ(1U, sink_->message_count());
   EXPECT_EQ(OVERSCROLL_NONE, overscroll_mode());
 
   // Since the overscroll mode has been reset, the next scroll update events
@@ -2546,6 +2548,33 @@ TEST_F(RenderWidgetHostViewAuraOverscrollTest, OverscrollDirectionChange) {
   EXPECT_EQ(OVERSCROLL_NONE, overscroll_mode());
 }
 
+TEST_F(RenderWidgetHostViewAuraOverscrollTest,
+       OverscrollDirectionChangeMouseWheel) {
+  SetUpOverscrollEnvironment();
+
+  // Send wheel event and receive ack as not consumed.
+  SimulateWheelEvent(125, -5, 0, true);
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+  SendInputEventACK(WebInputEvent::MouseWheel,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_EQ(OVERSCROLL_EAST, overscroll_mode());
+  EXPECT_EQ(OVERSCROLL_EAST, overscroll_delegate()->current_mode());
+  EXPECT_EQ(0U, sink_->message_count());
+
+  // Send another wheel event, but in the reverse direction. The overscroll
+  // controller will not consume the event, because it is not triggering
+  // gesture-nav.
+  SimulateWheelEvent(-260, 0, 0, true);
+  EXPECT_EQ(1U, sink_->message_count());
+  EXPECT_EQ(OVERSCROLL_NONE, overscroll_mode());
+
+  // Since the overscroll mode has been reset, the next wheel event should reach
+  // the renderer.
+  SimulateWheelEvent(-20, 0, 0, true);
+  EXPECT_EQ(1U, sink_->message_count());
+  EXPECT_EQ(OVERSCROLL_NONE, overscroll_mode());
+}
+
 // Tests that if a mouse-move event completes the overscroll gesture, future
 // move events do reach the renderer.
 TEST_F(RenderWidgetHostViewAuraOverscrollTest, OverscrollMouseMoveCompletion) {