Make draw* lines responsible for cache management

src/gpu/text/GrAtlasTextBlob.cpp

Index: src/gpu/text/GrAtlasTextBlob.cpp
diff --git a/src/gpu/text/GrAtlasTextBlob.cpp b/src/gpu/text/GrAtlasTextBlob.cpp
index dee6d133e3806f107272af58751fd7ed1cd05410..f79f82598f6570b4d1a78184180ac8bd78288bbc 100644
--- a/src/gpu/text/GrAtlasTextBlob.cpp
+++ b/src/gpu/text/GrAtlasTextBlob.cpp
@@ -13,9 +13,25 @@
 #include "GrTextUtils.h"
 #include "SkColorFilter.h"
 #include "SkDrawFilter.h"
+#include "SkGlyphCache.h"
 #include "SkTextBlobRunIterator.h"
 #include "batches/GrAtlasTextBatch.h"
 
+SkGlyphCache* GrAtlasTextBlob::setupCache(int runIndex,
+                                          const SkSurfaceProps& props,
+                                          const SkPaint& skPaint,
+                                          const SkMatrix* viewMatrix,
+                                          bool noGamma) {
+    GrAtlasTextBlob::Run* run = &fRuns[runIndex];
+
+    // if we have an override descriptor for the run, then we should use that
+    SkAutoDescriptor* desc = run->fOverrideDescriptor.get() ? run->fOverrideDescriptor.get() :
+                                                              &run->fDescriptor;
+    skPaint.getScalerContextDescriptor(desc, props, viewMatrix, noGamma);
+    run->fTypeface.reset(SkSafeRef(skPaint.getTypeface()));
+    return SkGlyphCache::DetachCache(run->fTypeface, desc->getDesc());
+}
+
 void GrAtlasTextBlob::appendGlyph(int runIndex,
                                   const SkRect& positions,
                                   GrColor color,