Migrate most of cc/ from WebKit::WebTransformationMatrix to gfx::Transform

cc/damage_tracker.cc

Index: cc/damage_tracker.cc
diff --git a/cc/damage_tracker.cc b/cc/damage_tracker.cc
index e10461d9aa771fbf8db685ce1e70b277b5e7c4f1..90bda68ac0b911af1aa328a02a2e449e32d64b2a 100644
--- a/cc/damage_tracker.cc
+++ b/cc/damage_tracker.cc
@@ -10,7 +10,7 @@
 #include "cc/render_surface_impl.h"
 #include <public/WebFilterOperations.h>
 
-using WebKit::WebTransformationMatrix;
+using gfx::Transform;
 
 namespace cc {
 
@@ -306,12 +306,12 @@ void DamageTracker::extendDamageForRenderSurface(LayerImpl* layer, gfx::RectF& t
 
     // If there was damage, transform it to target space, and possibly contribute its reflection if needed.
     if (!damageRectInLocalSpace.IsEmpty()) {
-        const WebTransformationMatrix& drawTransform = renderSurface->drawTransform();
+        const Transform& drawTransform = renderSurface->drawTransform();
         gfx::RectF damageRectInTargetSpace = MathUtil::mapClippedRect(drawTransform, damageRectInLocalSpace);
         targetDamageRect.Union(damageRectInTargetSpace);
 
         if (layer->replicaLayer()) {
-            const WebTransformationMatrix& replicaDrawTransform = renderSurface->replicaDrawTransform();
+            const Transform& replicaDrawTransform = renderSurface->replicaDrawTransform();
             targetDamageRect.Union(MathUtil::mapClippedRect(replicaDrawTransform, damageRectInLocalSpace));
         }
     }
@@ -323,7 +323,7 @@ void DamageTracker::extendDamageForRenderSurface(LayerImpl* layer, gfx::RectF& t
         bool replicaIsNew = false;
         removeRectFromCurrentFrame(replicaMaskLayer->id(), replicaIsNew);
 
-        const WebTransformationMatrix& replicaDrawTransform = renderSurface->replicaDrawTransform();
+        const Transform& replicaDrawTransform = renderSurface->replicaDrawTransform();
         gfx::RectF replicaMaskLayerRect = MathUtil::mapClippedRect(replicaDrawTransform, gfx::RectF(gfx::PointF(), replicaMaskLayer->bounds()));
         saveRectForNextFrame(replicaMaskLayer->id(), replicaMaskLayerRect);