Allocate only the vertices we need for text.

src/gpu/GrTextContext.h

Index: src/gpu/GrTextContext.h
diff --git a/src/gpu/GrTextContext.h b/src/gpu/GrTextContext.h
index 95344dd39fbea0ee3e7c4095c828ae0c88bc1f63..4f7207b04c0edc07eed403b0791e5b72561f80f2 100644
--- a/src/gpu/GrTextContext.h
+++ b/src/gpu/GrTextContext.h
@@ -57,8 +57,9 @@ protected:
     void finish() { fDrawTarget = NULL; }
 
     static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache);
-    static void MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
-                            const char text[], size_t byteLength, SkVector* stopVector);
+    // sets extent in stopVector and returns glyph count
+    static int MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
+                           const char text[], size_t byteLength, SkVector* stopVector);
 };
 
 #endif