Android: disable 2d canvas AA in a different place.

Android: disable 2d canvas AA in a different place.

Instead of disabling 2d canvas antialiasing for Android in
content_startup_flags (which can't easily be overridden by content
embedders), disable it in chrome_startup_flags (which disables it for
Chrome and Chromium TestShell on Android, which is what was desired) and
also in shell_main_delegate (which disables it for ContentShell on
Android for the purposes of consistency in manual/automated testing).
Other content embedders (such as android_webview) are now free to
control this flag themselves.

BUG=213238
R=pfeldman@chromium.org, senorblanco@chromium.org, yfriedman@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=227928

[Torne, 2013-10-10 10:51:56]

Hi Stephen, Grace,

We want to move this flag to be enabled for Chrome and ContentShell specifically
rather than all content embedders on Android (so that WebView can have it
enabled). Does this look okay?

[Torne, 2013-10-10 10:54:16]

+tedchoc for OWNERS in chrome/browser/android and content/browser/android
+pfeldman for OWNERS in content/shell/app

[pfeldman, 2013-10-10 12:14:46]

shell rs lgtm

[Stephen White, 2013-10-10 12:31:36]

LGTM, although I'm not an expert in this code

[Yaron, 2013-10-10 13:09:10]

lgtm

[commit-bot: I haz the power, 2013-10-10 13:09:35]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a lowly provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Torne, 2013-10-10 14:20:55]

Committed patchset #1 manually as r227928 (presubmit successful).