Disable double tap zoom on mobile sites, to remove 300ms click delay

This patch disables double tap zoom on pages that have a
width=device-width or narrower viewport (indicating that this is a
mobile-optimized or responsive website).

Double tap zoom continues to be disabled for pages that disallow the
user from zooming (even if they don't have a device-width or narrower
viewport).

This causes very noticeable performance benefits: links, buttons,
checkboxes, etc respond within around 10ms instead of 300ms.
Tested this on: http://jsbin.com/ixibol/6

Users shouldn't miss the double-tap gesture in the affected
situations, as double-tap means "zoom until tapped content is legible",
and in all the cases above the content was already legible (already
displayed at 1 or more DIPs per CSS pixel), so double tap zoom didn't
make sense and didn't do much.

BUG=169642
NOTRY=true

Review URL: https://codereview.chromium.org/18850005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232245 0039d316-1c4b-4281-b951-d872f2087c98
Add 'Inspect' Links for views in the Extension Error Console

Add the option to inspect a resource or render view in the error console,
opening the developer tools for that resource/view.

Goes with: https://codereview.chromium.org/23816005

BUG=21734
TBR=yoshiki@chromium.org (task_manager)
TBR=ben@chromium.org (ui [refactor only])

Review URL: https://codereview.chromium.org/23459008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232246 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232246
Adds MobileOmniboxRefineSuggestion action.

Add the name of the new Android UMA metric.

BUG=304294

Review URL: https://codereview.chromium.org/46373006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232247 0039d316-1c4b-4281-b951-d872f2087c98
Plumb device scale adjustment separately.

This value was previously computed into the font scale factor.

BUG=252828

Review URL: https://codereview.chromium.org/49043010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232248 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232247
SVN changes up to revision 232248