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

cc/gl_renderer.cc

Index: cc/gl_renderer.cc
diff --git a/cc/gl_renderer.cc b/cc/gl_renderer.cc
index 94f8d83124f945b5118af3f5b1d07a7bbcdc5fba..4de023c28e47bdbb7a64650a5c04a901c1ed05da 100644
--- a/cc/gl_renderer.cc
+++ b/cc/gl_renderer.cc
@@ -405,7 +405,8 @@ static SkBitmap applyImageFilter(GLRenderer* renderer, SkImageFilter* filter, Sc
     // Place the platform texture inside an SkBitmap.
     SkBitmap source;
     source.setConfig(SkBitmap::kARGB_8888_Config, sourceTexture->size().width(), sourceTexture->size().height());
-    source.setPixelRef(new SkGrPixelRef(texture.get()))->unref();
+    skia::RefPtr<SkGrPixelRef> pixelRef = new SkGrPixelRef(texture.get());
+    source.setPixelRef(pixelRef.get());
 
     // Create a scratch texture for backing store.
     GrTextureDesc desc;
@@ -533,7 +534,7 @@ void GLRenderer::drawRenderPassQuad(DrawingFrame& frame, const RenderPassDrawQua
     // Apply filters to the contents texture.
     SkBitmap filterBitmap;
     if (renderPass->filter) {
-        filterBitmap = applyImageFilter(this, renderPass->filter, contentsTexture, m_client->hasImplThread());
+        filterBitmap = applyImageFilter(this, renderPass->filter.get(), contentsTexture, m_client->hasImplThread());
     } else {
         filterBitmap = applyFilters(this, renderPass->filters, contentsTexture, m_client->hasImplThread());
     }