Return false in AcceleratorController::Process() if an accelerator has no effect

Return false in AcceleratorController::Process() if an accelerator has no effect

This CL allows web pages to intercept the Ctrl+Shift+0 accelerator when no UI scaling is applied (which is the common case)

BUG=404473
TEST=None

Committed: https://crrev.com/7749fc5773c32fd67da38aa8f9e849fd14f4a64e
Cr-Commit-Position: refs/heads/master@{#300370}

[pkotwicz, 2014-10-19 19:13:53]

pkotwicz@chromium.org changed reviewers:
+ oshima@chromium.org

[pkotwicz, 2014-10-19 19:17:55]

Oshima, can you please take a look?

This is the first step in getting accelerators to work when a menu is open
again.

[oshima, 2014-10-20 19:10:10]

lgtm

[pkotwicz, 2014-10-20 19:25:05]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2014-10-20 19:26:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/668573002/1

[commit-bot: I haz the power, 2014-10-20 21:56:15]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-20 21:56:21]

Try jobs failed on following builders:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[pkotwicz, 2014-10-20 22:13:31]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2014-10-20 22:16:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/668573002/1

[commit-bot: I haz the power, 2014-10-20 22:52:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-20 22:52:45]

Patchset 1 (id:??) landed as
https://crrev.com/7749fc5773c32fd67da38aa8f9e849fd14f4a64e
Cr-Commit-Position: refs/heads/master@{#300370}