Make max number of vertex attributes be checked dynamically

src/gpu/GrGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpu_DEFINED
 #define GrGpu_DEFINED
 
@@ skipping 362 matching lines @@
         SkAutoTDeleteArray<const SkPoint>  fSampleLocations;
     };
 
     // Finds a render target's multisample specs. The stencil settings are only needed to flush the
     // draw state prior to querying multisample information; they should not have any effect on the
     // multisample information itself.
     const MultisampleSpecs& getMultisampleSpecs(GrRenderTarget*, const GrStencilSettings&);
 
     // We pass in an array of meshCount GrMesh to the draw. The backend should loop over each
     // GrMesh object and emit a draw for it. Each draw will use the same GrPipeline and
-    // GrPrimitiveProcessor.
-    void draw(const GrPipeline&,
+    // GrPrimitiveProcessor. This may fail if the draw would exceed any resource limits (e.g.
+    // number of vertex attributes is too large).
+    bool draw(const GrPipeline&,
               const GrPrimitiveProcessor&,
               const GrMesh*,
               int meshCount);
 
     // Called by drawtarget when flushing. 
     // Provides a hook for post-flush actions (e.g. PLS reset and Vulkan command buffer submits).
     virtual void finishDrawTarget() {}
 
     ///////////////////////////////////////////////////////////////////////////
     // Debugging and Stats
@@ skipping 230 matching lines @@
     SkTArray<const MultisampleSpecs*, true>                             fMultisampleSpecsMap;
     GrTAllocator<MultisampleSpecs>                                      fMultisampleSpecsAllocator;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif