Revert of Consolidate GPU buffer implementations

src/gpu/batches/GrAtlasTextBatch.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAtlasTextBatch.h"
 
 #include "GrBatchFlushState.h"
@@ skipping 101 matching lines @@
     }
 
     FlushInfo flushInfo;
     flushInfo.fGlyphsToFlush = 0;
     size_t vertexStride = gp->getVertexStride();
     SkASSERT(vertexStride == GrAtlasTextBlob::GetVertexStride(maskFormat));
 
     target->initDraw(gp);
 
     int glyphCount = this->numGlyphs();
-    const GrBuffer* vertexBuffer;
+    const GrVertexBuffer* vertexBuffer;
 
     void* vertices = target->makeVertexSpace(vertexStride,
                                              glyphCount * kVerticesPerGlyph,
                                              &vertexBuffer,
                                              &flushInfo.fVertexOffset);
     flushInfo.fVertexBuffer.reset(SkRef(vertexBuffer));
     flushInfo.fIndexBuffer.reset(target->resourceProvider()->refQuadIndexBuffer());
     if (!vertices || !flushInfo.fVertexBuffer) {
         SkDebugf("Could not allocate vertices\n");
         return;
@@ skipping 41 matching lines @@
 
     // Make sure to attach the last cache if applicable
     if (cache) {
         SkGlyphCache::AttachCache(cache);
     }
     this->flush(target, &flushInfo);
 }
 
 void GrAtlasTextBatch::flush(GrVertexBatch::Target* target, FlushInfo* flushInfo) const {
     GrMesh mesh;
-    int maxGlyphsPerDraw =
-        static_cast<int>(flushInfo->fIndexBuffer->gpuMemorySize() / sizeof(uint16_t) / 6);
+    int maxGlyphsPerDraw = flushInfo->fIndexBuffer->maxQuads();
     mesh.initInstanced(kTriangles_GrPrimitiveType, flushInfo->fVertexBuffer,
                        flushInfo->fIndexBuffer, flushInfo->fVertexOffset,
                        kVerticesPerGlyph, kIndicesPerGlyph, flushInfo->fGlyphsToFlush,
                        maxGlyphsPerDraw);
     target->draw(mesh);
     flushInfo->fVertexOffset += kVerticesPerGlyph * flushInfo->fGlyphsToFlush;
     flushInfo->fGlyphsToFlush = 0;
 }
 
 bool GrAtlasTextBatch::onCombineIfPossible(GrBatch* t, const GrCaps& caps) {
@@ skipping 113 matching lines @@
                                                     this->usesLocalCoords());
 #endif
     }
 
 }
 
 void GrBlobRegenHelper::flush() {
     fBatch->flush(fTarget, fFlushInfo);
     fTarget->initDraw(fGP);
 }