Updating trunk VERSION from 1702.0 to 1703.0

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233482 0039d316-1c4b-4281-b951-d872f2087c98
Introduce separate client and init path for single-threaded cc

The chromium compositor can be used in either a single-threaded fashion
or multi-threaded. The requirements, APIs and responsibilities of the embedder
are different for these two modes. Some users of cc only use one path
or the other. This adds a separate client interface and initialization
path for code that only uses the single threaded path.

Having a dedicated client for the single threaded path will make it
possible to get rid of the WebGraphicsContext3DSwapBuffersClient which
will then make it easier to break cc's dependency on WGC3D.

R=piman
BUG=181120

Review URL: https://codereview.chromium.org/61823008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233483 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233483