Convert GrMesh back to a class

Specific methods that limit the data to valid configurations are better
than a runtime mega-assert.

Bug: skia:
Change-Id: Ie15f2dc79659e44cfaddd16eb474795b110fda73
Reviewed-on: https://skia-review.googlesource.com/16577
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrGpuCommandBuffer.h b/src/gpu/GrGpuCommandBuffer.h
index fb54b2e..fb5dc00 100644
--- a/src/gpu/GrGpuCommandBuffer.h
+++ b/src/gpu/GrGpuCommandBuffer.h
@@ -14,7 +14,7 @@
 class GrOpFlushState;
 class GrFixedClip;
 class GrGpu;
-struct GrMesh;
+class GrMesh;
 class GrPipeline;
 class GrPrimitiveProcessor;
 class GrRenderTarget;
@@ -68,7 +68,7 @@
     // number of vertex attributes is too large).
     bool draw(const GrPipeline&,
               const GrPrimitiveProcessor&,
-              const GrMesh*,
+              const GrMesh[],
               int meshCount,
               const SkRect& bounds);