overscroll: Do not overscroll if the beginning of a scroll was consumed.

overscroll: Do not overscroll if the beginning of a scroll was consumed.

If the start of a scroll gesture scrolls the actual content on the page, then
that scroll-sequence should not do overscroll, even if the page runs out of
scrollable content, until the user restarts the scroll sequence (by lifting
fingers from the touchpad/touchscreen).

BUG=179484
R=sky@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=201676

[sky, 2013-05-23 00:07:49]

LGTM

https://codereview.chromium.org/15742013/diff/1/content/browser/renderer_host...
File content/browser/renderer_host/overscroll_controller.cc (right):

https://codereview.chromium.org/15742013/diff/1/content/browser/renderer_host...
content/browser/renderer_host/overscroll_controller.cc:106: if (scroll_state_ ==
STATE_UNKNOWN) {
nit: combine this into a single if.

[sadrul, 2013-05-23 02:01:35]

https://codereview.chromium.org/15742013/diff/1/content/browser/renderer_host...
File content/browser/renderer_host/overscroll_controller.cc (right):

https://codereview.chromium.org/15742013/diff/1/content/browser/renderer_host...
content/browser/renderer_host/overscroll_controller.cc:106: if (scroll_state_ ==
STATE_UNKNOWN) {
On 2013/05/23 00:07:49, sky wrote:
> nit: combine this into a single if.

Done.

[sadrul, 2013-05-23 04:11:33]

Committed patchset #2 manually as r201676 (presubmit successful).