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

cc/layer_tree_host.cc

Index: cc/layer_tree_host.cc
diff --git a/cc/layer_tree_host.cc b/cc/layer_tree_host.cc
index 003f13031f6ff46d1fadbba44f5e22ebcf329160..411e29f906762793d984fa77970368bdb25ff7c3 100644
--- a/cc/layer_tree_host.cc
+++ b/cc/layer_tree_host.cc
@@ -734,17 +734,17 @@ void LayerTreeHost::applyScrollAndScale(const ScrollAndScaleSet& info)
 gfx::PointF LayerTreeHost::adjustEventPointForPinchZoom(const gfx::PointF& point)
     const
 {
-    WebKit::WebTransformationMatrix inverseImplTransform = m_implTransform;
+    gfx::Transform inverseImplTransform = m_implTransform;
     // TODO(wjmaclean) Need to determine why the next two lines are
     // necessary for this to work ... it seems like just inverting
     // m_implTransform should be sufficient.
-    DCHECK(inverseImplTransform.m11());
-    DCHECK(inverseImplTransform.m22());
-    inverseImplTransform.setM41(inverseImplTransform.m41()
-        / inverseImplTransform.m11());
-    inverseImplTransform.setM42(inverseImplTransform.m42()
-        / inverseImplTransform.m22());
-    inverseImplTransform = inverseImplTransform.inverse();
+    DCHECK(inverseImplTransform.matrix().getDouble(0, 0));
+    DCHECK(inverseImplTransform.matrix().getDouble(1, 1));
+    inverseImplTransform.matrix().setDouble(0, 3, inverseImplTransform.matrix().getDouble(0, 3)
+        / inverseImplTransform.matrix().getDouble(0, 0));
+    inverseImplTransform.matrix().setDouble(1, 3, inverseImplTransform.matrix().getDouble(1, 3)
+        / inverseImplTransform.matrix().getDouble(1, 1));
+    inverseImplTransform = MathUtil::inverse(inverseImplTransform);
     bool wasClipped = false;
     gfx::PointF adjustedPoint = MathUtil::projectPoint(inverseImplTransform, point, wasClipped);
     DCHECK(!wasClipped);
@@ -752,7 +752,7 @@ gfx::PointF LayerTreeHost::adjustEventPointForPinchZoom(const gfx::PointF& point
     return adjustedPoint;
 }
 
-void LayerTreeHost::setImplTransform(const WebKit::WebTransformationMatrix& transform)
+void LayerTreeHost::setImplTransform(const gfx::Transform& transform)
 {
     m_implTransform = transform;
 }