Make GrTextureStripAtlas flush pending IO on newly acquired texture

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 06c27ea2cfaf3b71791caf3b3b408ed4efa90972..5f4e663580a7e525cdac0f07f110a9b7f70e909e 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -594,6 +594,14 @@ void GrContext::flushSurfaceWrites(GrSurface* surface) {
     }
 }
 
+void GrContext::flushSurfaceIO(GrSurface* surface) {
+    ASSERT_SINGLE_OWNER
+    RETURN_IF_ABANDONED
+    if (surface->surfacePriv().hasPendingIO()) {
+        this->flush();
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 int GrContext::getRecommendedSampleCount(GrPixelConfig config,
                                          SkScalar dpi) const {