cc: Make PaintCanvas abstract

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index de25773aeb57ec3998d1473cc65ccb7cd58d7999..b9badbc97192bbe2dbe90d004383ea826136b1e7 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -1240,7 +1240,7 @@ void GraphicsLayer::checkPaintUnderInvalidations(const PaintRecord& newRecord) {
   oldBitmap.allocPixels(
       SkImageInfo::MakeN32Premul(rect.width(), rect.height()));
   {
-    PaintCanvas canvas(oldBitmap);
+    SkiaPaintCanvas canvas(oldBitmap);
     canvas.clear(SK_ColorTRANSPARENT);
     canvas.translate(-rect.x(), -rect.y());
     canvas.drawPicture(tracking->lastPaintedRecord.get());
@@ -1250,7 +1250,7 @@ void GraphicsLayer::checkPaintUnderInvalidations(const PaintRecord& newRecord) {
   newBitmap.allocPixels(
       SkImageInfo::MakeN32Premul(rect.width(), rect.height()));
   {
-    PaintCanvas canvas(newBitmap);
+    SkiaPaintCanvas canvas(newBitmap);
     canvas.clear(SK_ColorTRANSPARENT);
     canvas.translate(-rect.x(), -rect.y());
     canvas.drawPicture(&newRecord);