Add Batch logging

src/gpu/GrBatch.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrBatch_DEFINED
 #define GrBatch_DEFINED
 
@@ skipping 18 matching lines @@
  *
  * Batches are created when GrContext processes a draw call. Batches of the same  subclass may be
  * merged using combineIfPossible. When two batches merge, one takes on the union of the data
  * and the other is left empty. The merged batch becomes responsible for drawing the data from both
  * the original batches.
  *
  * If there are any possible optimizations which might require knowing more about the full state of
  * the draw, ie whether or not the GrBatch is allowed to tweak alpha for coverage, then this
  * information will be communicated to the GrBatch prior to geometry generation.
  */
+#define BATCH_SPEW

[bsalomon, 2015/08/06 17:54:12]

Since it's in a header, maybe GR_BATCH_SPEW?

Also we usually define macros to 0 to disable or 1 to enable. It allows you type
compound checks that are a mix of runtime and compile time without a lot if
#idef/#else:

if (GR_BATCH_SPEW && this->isAmazing()) {
   this->printSomeCoolStuff();
}

+#ifdef BATCH_SPEW
+    #define GrBATCH_INFO(...) SkDebugf(__VA_ARGS__)
+#else
+    #define GrBATCH_INFO(...)
+#endif
 
 class GrBatch : public GrNonAtomicRef {
 public:
     GrBatch() : fClassID(kIllegalBatchClassID), fNumberOfDraws(0) { SkDEBUGCODE(fUsed = false;) }
     virtual ~GrBatch() {}
 
     virtual const char* name() const = 0;
     virtual void getInvariantOutputColor(GrInitInvariantOutput* out) const = 0;
     virtual void getInvariantOutputCoverage(GrInitInvariantOutput* out) const = 0;
 
@@ skipping 120 matching lines @@
     };
     SkAutoTUnref<const GrPipeline> fPipeline;
     static int32_t gCurrBatchClassID;
     int fNumberOfDraws;
     SkDEBUGCODE(bool fUsed;)
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif