Add new WebKit/Source/build/scripts path to gyp_chromium

This is the Chromium-side change required for Blink build script rearrangement.
A follow up will be required once the Blink side lands.

R=abarth@chromium.org, adamk@chromium.org
BUG=297477

Review URL: https://codereview.chromium.org/26849002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227931 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227931
[android_webview] Update fixed layout size on page scale changes.

We should update the fixedLayoutSize even if the physical size of
the AwContents doesn't change. This is because the fixedLayoutSize
is directly derived from physical size and the pageScaleFactor, so
if either of these change the fixedLayoutSize should be updated.
Currently the AwLayoutSizer code assumes that every requestLayout
results in an onSizeChanged, but that's not always the case.

BUG=internal b/10917278
TEST=AndroidWebViewTest
R=joth@chromium.org

Review URL: https://codereview.chromium.org/26705002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227932 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227932