Migrate more functions from MathUtil to gfx::Transform

cc/video_layer_impl.cc

Index: cc/video_layer_impl.cc
diff --git a/cc/video_layer_impl.cc b/cc/video_layer_impl.cc
index 130e6f2460a25cd0b60ce6c9612d6a1c1846addb..59d7c2c507e1717a297a0d2a2712cafa481e380e 100644
--- a/cc/video_layer_impl.cc
+++ b/cc/video_layer_impl.cc
@@ -29,7 +29,7 @@ VideoLayerImpl::VideoLayerImpl(LayerTreeImpl* treeImpl, int id, VideoFrameProvid
     , m_externalTextureResource(0)
 {
     // This matrix is the default transformation for stream textures, and flips on the Y axis.
-    m_streamTextureMatrix = MathUtil::createGfxTransform(
+    m_streamTextureMatrix = gfx::Transform(
         1, 0, 0, 0,
         0, -1, 0, 0,
         0, 0, 1, 0,
@@ -401,7 +401,7 @@ void VideoLayerImpl::DidReceiveFrame()
 
 void VideoLayerImpl::DidUpdateMatrix(const float matrix[16])
 {
-    m_streamTextureMatrix = MathUtil::createGfxTransform(
+    m_streamTextureMatrix = gfx::Transform(
         matrix[0], matrix[1], matrix[2], matrix[3],
         matrix[4], matrix[5], matrix[6], matrix[7],
         matrix[8], matrix[9], matrix[10], matrix[11],