Revert of Add RGB565 Texture readback support in gl_helper (https://codereview.chromium.org/88033002/)

Reason for revert:
content_gl_tests failing on multiple gpu bots on the chromium.webkit buildbot.

Example: http://chromegw.corp.google.com/i/chromium.webkit/builders/GPU%20Mac10.7/builds/19123

Original issue's description:
> Add RGB565 Texture readback support in gl_helper
> 
> Plan is to add a RGB565 readback and copy conversion for RGBA8 to RGB565 in GLHelper.
> 
> BUG=323150
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245431

TBR=dtrainor@chromium.org,sievers@chromium.org,hubbe@chromium.org,aelias@chromium.org,piman@chromium.org,siva.gunturi@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=323150

Review URL: https://codereview.chromium.org/137783022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245477 0039d316-1c4b-4281-b951-d872f2087c98
Telemetry: Fix timeline frame counting on Mac

We want to count the last the last swap in the embedding
chain. Usually there is a hardware swap for this but on mac
there doesn't appear to be one. This uses the decoder swap
for now until we know the canonical swap call and add a trace
there.

TBR=nduca@chromium.org
NOTRY=true

No-try since this is blocking this from working on the mac and I've run the tests locally.

Review URL: https://codereview.chromium.org/141163004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245478 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245477
cc: disable pre-painting when using gpu rasterization.

R=enne@chromium.org
BUG=333045

Review URL: https://codereview.chromium.org/137993013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245479 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245479
Add credential passing API for Chrome OS SAML login

This CL adds an API that SAML IdPs can use to pass credentials to
Chrome OS during login instead of relying on password scraping.

BUG=127095
TEST=New browser test + manual

Review URL: https://codereview.chromium.org/138133006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245480 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245480