Add skia::RefPtr class to wrap ref counted classes from Skia.

cc/render_surface_filters.cc

Index: cc/render_surface_filters.cc
diff --git a/cc/render_surface_filters.cc b/cc/render_surface_filters.cc
index 4b9a49d934e26023a8283f6d7ae0104611151a11..ef2f2d822b8607b3eb591d433e073c9c7199b43f 100644
--- a/cc/render_surface_filters.cc
+++ b/cc/render_surface_filters.cc
@@ -5,6 +5,7 @@
 #include "cc/render_surface_filters.h"
 
 #include "base/logging.h"
+#include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/effects/SkBlurImageFilter.h"
 #include "third_party/skia/include/effects/SkColorMatrixFilter.h"
@@ -246,10 +247,11 @@ public:
         platformTextureDescription.fHeight = size.height();
         platformTextureDescription.fConfig = kSkia8888_GrPixelConfig;
         platformTextureDescription.fTextureHandle = textureId;
-        SkAutoTUnref<GrTexture> texture(grContext->createPlatformTexture(platformTextureDescription));
+        skia::RefPtr<GrTexture> texture(grContext->createPlatformTexture(platformTextureDescription));
         // Place the platform texture inside an SkBitmap.
         m_source.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
-        m_source.setPixelRef(new SkGrPixelRef(texture.get()))->unref();
+        skia::RefPtr<SkGrPixelRef> pixelRef = new SkGrPixelRef(texture.get());
+        m_source.setPixelRef(pixelRef.get());
     }
 
     ~FilterBufferState() { }
@@ -287,7 +289,8 @@ public:
         m_canvas.reset(0);
         m_device.reset(0);
 
-        m_source.setPixelRef(new SkGrPixelRef(m_scratchTextures[m_currentTexture].get()))->unref();
+        skia::RefPtr<SkGrPixelRef> pixelRef = new SkGrPixelRef(m_scratchTextures[m_currentTexture].get());
+        m_source.setPixelRef(pixelRef.get());
         m_currentTexture = 1 - m_currentTexture;
     }
 
@@ -381,7 +384,8 @@ SkBitmap RenderSurfaceFilters::apply(const WebKit::WebFilterOperations& filters,
         switch (op.type()) {
         case WebKit::WebFilterOperation::FilterTypeColorMatrix: {
             SkPaint paint;
-            paint.setColorFilter(new SkColorMatrixFilter(op.matrix()))->unref();
+            skia::RefPtr<SkColorMatrixFilter> filter = new SkColorMatrixFilter(op.matrix());
+            paint.setColorFilter(filter.get());
             canvas->drawBitmap(state.source(), 0, 0, &paint);
             break;
         }