Add tiled rendering as an option to GM.

Add tiled rendering as an option to GM.

Use an SkGPipe to play back drawing into tiles.
This will help us to debug differences in drawing
while tiled.

Pass --tiledPipe to gm to use the tiled pipe.
Committed: https://code.google.com/p/skia/source/detail?r=4199

[reed1, 2012-06-06 19:09:16]

lets extract the TileController into a sample file for reuse

https://codereview.appspot.com/6295050/diff/1/src/pipe/SkGPipeRead.cpp
File src/pipe/SkGPipeRead.cpp (right):

https://codereview.appspot.com/6295050/diff/1/src/pipe/SkGPipeRead.cpp#newcod...
src/pipe/SkGPipeRead.cpp:559: void SkGPipeReader::setCanvas(SkCanvas *target) {
SkRefCnt_SafeAssign(fCanvas, target);

[Leon, 2012-06-06 19:45:11]

Moved TiledPipeController into its own files.

https://codereview.appspot.com/6295050/diff/1/src/pipe/SkGPipeRead.cpp
File src/pipe/SkGPipeRead.cpp (right):

https://codereview.appspot.com/6295050/diff/1/src/pipe/SkGPipeRead.cpp#newcod...
src/pipe/SkGPipeRead.cpp:559: void SkGPipeReader::setCanvas(SkCanvas *target) {
On 2012/06/06 19:09:16, reed1 wrote:
> SkRefCnt_SafeAssign(fCanvas, target);

Done.

[reed1, 2012-06-06 20:39:53]

If you want, you can commit the SkGPipeReader files now, since that change
(adding setCanvas) stands on its own.

https://codereview.appspot.com/6295050/diff/3002/src/pipe/utils/SamplePipeCon...
File src/pipe/utils/SamplePipeControllers.h (right):

https://codereview.appspot.com/6295050/diff/3002/src/pipe/utils/SamplePipeCon...
src/pipe/utils/SamplePipeControllers.h:14: public:
Why do we pass this guy a canvas?

https://codereview.appspot.com/6295050/diff/3002/src/pipe/utils/SamplePipeCon...
src/pipe/utils/SamplePipeControllers.h:32: public:
const SkBitmap&

[Leon, 2012-06-06 20:49:55]

https://codereview.appspot.com/6295050/diff/3002/src/pipe/utils/SamplePipeCon...
File src/pipe/utils/SamplePipeControllers.h (right):

https://codereview.appspot.com/6295050/diff/3002/src/pipe/utils/SamplePipeCon...
src/pipe/utils/SamplePipeControllers.h:14: public:
On 2012/06/06 20:39:53, reed1 wrote:
> Why do we pass this guy a canvas?

He passes it to the SkGPipeReader.

https://codereview.appspot.com/6295050/diff/3002/src/pipe/utils/SamplePipeCon...
src/pipe/utils/SamplePipeControllers.h:32: public:
On 2012/06/06 20:39:53, reed1 wrote:
> const SkBitmap&

Done.

[reed1, 2012-06-06 20:53:39]

lgtm