Add a bit to not bubble scrolls to parent scrolling layers

cc/input_handler.h

Index: cc/input_handler.h
diff --git a/cc/input_handler.h b/cc/input_handler.h
index 2016f282c75c887f9e49bc68cc50fc7358e5ceab..662cae4b25c8742b5a659388911586d4e52cfe04 100644
--- a/cc/input_handler.h
+++ b/cc/input_handler.h
@@ -46,7 +46,7 @@ public:
     // direction at all, then false is returned. If any layer is moved, then
     // true is returned.
     // Should only be called if scrollBegin() returned ScrollStarted.
-    virtual bool scrollBy(const gfx::Point&, const gfx::Vector2d&) = 0;
+    virtual bool scrollBy(const gfx::Point&, const gfx::Vector2d&, bool shouldBubble) = 0;

[jamesr, 2013/01/29 05:52:24]

why do you need another bool? you have the scroll type in scrollBegin() which
IIUC determines the bubbling behavior of the scroll sequence

[Sami, 2013/01/29 11:42:34]

We still want to bubble slow gesture scrolls as opposed to flings. We could add
another ScrollInputType, e.g., NonBubblingGesture so we can tell the two apart.
Alternatively it could be a boolean, although I don't think there's ever a need
to avoid bubbling mouse wheel events.

Generally a fling starts with a normal gesture scroll which then turns into a
fling when the gesture is recognized. Earlier I thought these were part of the
same scrollBegin/End transaction, but turns out we start a new one when the
fling animation kicks in. So, let's add a way to tell scrollBegin whether we
want to bubble or not and leave scrollBy as it is.

[Yusuf, 2013/01/29 18:59:21]

OK. Sorry I didn't notice that we can use scrollType for this. I will add
another state to the enum.


On 2013/01/29 11:42:34, Sami wrote:

 
     // Stop scrolling the selected layer. Should only be called if scrollBegin()
     // returned ScrollStarted.