Mark webperf's test_resource_initiator_types.html as flaky timeout.

Also update the bug number on some of the other tests to refer to the
Chromium/Blink bug, rather than a closed webkit bug.

TBR=dstockwell@chromium.org
BUG=237003

Review URL: https://codereview.chromium.org/14706004

git-svn-id: svn://svn.chromium.org/blink/trunk@149482 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Reland "Move setting of additional headers from CachedResource to CachedResourceLoader"

This reverts commit 3ec001a0c8b4738766914b130c98eb83b3ec3228.

This patch was reverted due to crashes trying to load a resource in the context
of a CachedResourceLoader detached from its Frame. Therefore, keep the frame
null-check in CachedResource::load().

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/14293029

git-svn-id: svn://svn.chromium.org/blink/trunk@149483 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Making GraphicsContext the owner of PlatformContext.

This will simplify future work.

R=jamesr@chromium.org
BUG=235468

Review URL: https://codereview.chromium.org/14550002

git-svn-id: svn://svn.chromium.org/blink/trunk@149484 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove dead code from Page

In WebKit, Page was something of a dumping ground for arbitrary state
or settings toggles. In Blink, most similar state lives elsewhere, so
all the code deleted herein is dead.

R=abarth

Review URL: https://chromiumcodereview.appspot.com/14712002

git-svn-id: svn://svn.chromium.org/blink/trunk@149485 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Include testRunnerEnableGrid.js in IE Grid tests

This is required to enable CSS Grid Layout under DRT. This makes one
extra test pass (the other one being invalid and now marked as such).

BUG=232413

Review URL: https://chromiumcodereview.appspot.com/14556005

git-svn-id: svn://svn.chromium.org/blink/trunk@149486 bbb929c8-8fbe-4397-9dbb-9b2b20218538