Add method to GrProgramResource to record that pending a execution was completed.

Add method to GrProgramResource to record that pending a execution was completed.

BUG=skia:2889
Committed: https://skia.googlesource.com/skia/+/ac8d6193eaa29e02d1786fe56efa98eefee74e50

[bsalomon, 2014-09-04 20:07:03]

bsalomon@google.com changed reviewers:
+ robertphillips@google.com

[bsalomon, 2014-09-04 20:07:04]

Adds functionality that should have been in
https://codereview.chromium.org/537773004/

This comes up when an effect is queued for a draw, a flush occurs, and meanwhile
the drawing code (text context) still has a ref on the effect. In that case the
effect's ref on the resource should go back from pending-io+ref to just a ref.

[robertphillips, 2014-09-04 20:11:36]

lgtm

[bsalomon, 2014-09-04 20:12:58]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2014-09-04 20:14:06]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/bsalomon@google.com/543833002/1

[commit-bot: I haz the power, 2014-09-04 20:14:08]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-04 20:14:09]

Failed to apply patch for include/gpu/GrProgramResource.h:
While running git apply --index -p1;
  error: patch failed: include/gpu/GrProgramResource.h:59
  error: include/gpu/GrProgramResource.h: patch does not apply

Patch:       include/gpu/GrProgramResource.h
Index: include/gpu/GrProgramResource.h
diff --git a/include/gpu/GrProgramResource.h b/include/gpu/GrProgramResource.h
index
c4fc00ed8290c29a97924dca1b6612efcc62807a..1043b3fe1fc632efe43c4f63ef1ce422a91ff0e5
100644
--- a/include/gpu/GrProgramResource.h
+++ b/include/gpu/GrProgramResource.h
@@ -59,7 +59,13 @@ private:
         to the resource using the program element or draw state. */
     void removeRef() const;
 
-    friend class GrDrawState;
+    /** Called to indicate that the previous pending IO is complete. Useful
when the owning object
+        still has refs, so it is not about to destroy this GrProgramResource,
but its previously
+        pending executions have been complete.
+     */
+    void pendingIOComplete() const;
+
+    friend class GrRODrawState;
     friend class GrProgramElement;
 
     GrGpuResource*      fResource;

[bsalomon, 2014-09-04 21:05:16]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2014-09-04 21:05:44]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/bsalomon@google.com/543833002/20001

[commit-bot: I haz the power, 2014-09-04 21:13:49]

Committed patchset #2 (id:20001) as ac8d6193eaa29e02d1786fe56efa98eefee74e50