Use createPlatformSurface in the SampleApp

Better fix for changing the viewport in sample app.

Create a platform description and base the size on the SkWindow
in order to create a RenderTarget, which results in changing the
viewport.  This allows us to use only GR calls.

In the Android sample app, fix the problem where nothing is drawn
in the first frame, and default to drawing in GL.

[bsalomon, 2011-06-16 15:30:20]

On 2011/06/16 15:23:26, Scroggo wrote:

LGTM

[reed1, 2011-06-16 17:51:13]

http://codereview.appspot.com/4642043/diff/1/samplecode/SampleApp.cpp
File samplecode/SampleApp.cpp (right):

http://codereview.appspot.com/4642043/diff/1/samplecode/SampleApp.cpp#newcode...
samplecode/SampleApp.cpp:1337: #ifdef ANDROID
why are we doing this on every draw?

[Scroggo, 2011-06-16 18:06:27]

http://codereview.appspot.com/4642043/diff/1/samplecode/SampleApp.cpp
File samplecode/SampleApp.cpp (right):

http://codereview.appspot.com/4642043/diff/1/samplecode/SampleApp.cpp#newcode...
samplecode/SampleApp.cpp:1337: #ifdef ANDROID
On 2011/06/16 17:51:13, reed1 wrote:
> why are we doing this on every draw?

We are not.  This is in onSizeChange.  We do this because the first draw does
not work for reasons I have not figured out yet.

[reed1, 2011-06-16 18:22:31]

Doh. I clicked the wrong "Expand All" link.

Lets add a comment to the code to this effect (i.e. "Needed to get a draw after
the resize").

LGTM