Media Galleries API Picasa: Windows Custom Database Locations

This code enables Picasa to find custom Windows database locations as defined in the registry. It also provides for overridden database locations for testing.

Depends on https://codereview.chromium.org/23513059/.

BUG=151701

Review URL: https://codereview.chromium.org/23456035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227656 0039d316-1c4b-4281-b951-d872f2087c98
Added suppression for TraceEventTestFixture::TraceContinuousSampling.

This is reporting race conditions on TSAN v2.

NOTRY=true
TBR=glider@chromium.org
BUG=305459

Review URL: https://codereview.chromium.org/26434003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227657 0039d316-1c4b-4281-b951-d872f2087c98
Fix WeakPtrFactory ordering problems in ui

BUG=303818

Review URL: https://codereview.chromium.org/26455003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227658 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227657
Trigger inline signin within avatar bubble

BUG=302037

Review URL: https://codereview.chromium.org/26494002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227659 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227659