Add text animation sample; tweak DrawShip sample

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index e051c7c76f830c71401eef91252826c9a1f79a0c..2d77a0f449fb5305592c6b44d1c05aad9b26075f 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -349,6 +349,10 @@ public:
     /** Enumerates all cached GPU resources and dumps their memory to traceMemoryDump. */
     void dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const;
 
+    /** Draw font cache texture to render target */
+    void drawFontCache(const SkRect& rect, GrMaskFormat format, const SkPaint& paint,
+                       GrRenderTarget* target);
+
 private:
     GrGpu*                          fGpu;
     const GrCaps*                   fCaps;