Reduce texture uploads for font atlas.

src/gpu/GrInOrderDrawBuffer.cpp

Index: src/gpu/GrInOrderDrawBuffer.cpp
diff --git a/src/gpu/GrInOrderDrawBuffer.cpp b/src/gpu/GrInOrderDrawBuffer.cpp
index 6a503bbfd582ecc6af5d9bfd2b35e8ee2bb7e103..deea72b90d961197fb148a4f0bf5090078122d34 100644
--- a/src/gpu/GrInOrderDrawBuffer.cpp
+++ b/src/gpu/GrInOrderDrawBuffer.cpp
@@ -9,6 +9,7 @@
 
 #include "GrBufferAllocPool.h"
 #include "GrDrawTargetCaps.h"
+#include "GrTextStrike.h"
 #include "GrGpu.h"
 #include "GrIndexBuffer.h"
 #include "GrPath.h"
@@ -557,6 +558,8 @@ void GrInOrderDrawBuffer::flush() {
         return;
     }
 
+    this->getContext()->getFontCache()->updateTextures();
+
     SkASSERT(kReserved_GeometrySrcType != this->getGeomSrc().fVertexSrc);
     SkASSERT(kReserved_GeometrySrcType != this->getGeomSrc().fIndexSrc);