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

cc/occlusion_tracker.cc

Index: cc/occlusion_tracker.cc
diff --git a/cc/occlusion_tracker.cc b/cc/occlusion_tracker.cc
index 513b330ce62718566053dc15ddb57e59c78b20fe..db2ddd452f4edf9c6a996aed35bddbdc231e3720 100644
--- a/cc/occlusion_tracker.cc
+++ b/cc/occlusion_tracker.cc
@@ -14,7 +14,7 @@
 #include "ui/gfx/rect_conversions.h"
 
 using namespace std;
-using WebKit::WebTransformationMatrix;
+using gfx::Transform;
 
 namespace cc {
 
@@ -121,7 +121,7 @@ void OcclusionTrackerBase<LayerType, RenderSurfaceType>::finishedRenderTarget(co
 }
 
 template<typename RenderSurfaceType>
-static inline Region transformSurfaceOpaqueRegion(const RenderSurfaceType* surface, const Region& region, const WebTransformationMatrix& transform)
+static inline Region transformSurfaceOpaqueRegion(const RenderSurfaceType* surface, const Region& region, const Transform& transform)
 {
     // Verify that rects within the |surface| will remain rects in its target surface after applying |transform|. If this is true, then
     // apply |transform| to each rect within |region| in order to transform the entire Region.
@@ -182,7 +182,7 @@ static inline void reduceOcclusion(const gfx::Rect& affectedArea, const gfx::Rec
 }
 
 template<typename LayerType>
-static void reduceOcclusionBelowSurface(LayerType* contributingLayer, const gfx::Rect& surfaceRect, const WebTransformationMatrix& surfaceTransform, LayerType* renderTarget, Region& occlusionInTarget, Region& occlusionInScreen)
+static void reduceOcclusionBelowSurface(LayerType* contributingLayer, const gfx::Rect& surfaceRect, const Transform& surfaceTransform, LayerType* renderTarget, Region& occlusionInTarget, Region& occlusionInScreen)
 {
     if (surfaceRect.IsEmpty())
         return;
@@ -249,7 +249,7 @@ void OcclusionTrackerBase<LayerType, RenderSurfaceType>::leaveToRenderTarget(con
 
 // FIXME: Remove usePaintTracking when paint tracking is on for paint culling.
 template<typename LayerType>
-static inline void addOcclusionBehindLayer(Region& region, const LayerType* layer, const WebTransformationMatrix& transform, const Region& opaqueContents, const gfx::Rect& clipRectInTarget, const gfx::Size& minimumTrackingSize, std::vector<gfx::Rect>* occludingScreenSpaceRects, std::vector<gfx::Rect>* nonOccludingScreenSpaceRects)
+static inline void addOcclusionBehindLayer(Region& region, const LayerType* layer, const Transform& transform, const Region& opaqueContents, const gfx::Rect& clipRectInTarget, const gfx::Size& minimumTrackingSize, std::vector<gfx::Rect>* occludingScreenSpaceRects, std::vector<gfx::Rect>* nonOccludingScreenSpaceRects)
 {
     DCHECK(layer->visibleContentRect().Contains(opaqueContents.bounds()));
 
@@ -309,7 +309,7 @@ void OcclusionTrackerBase<LayerType, RenderSurfaceType>::markOccludedBehindLayer
     // remain rectilinear, then we don't add any occlusion in screen space.
 
     if (layerTransformsToScreenKnown(layer)) {
-        WebTransformationMatrix targetToScreenTransform = m_stack.back().target->renderSurface()->screenSpaceTransform();
+        Transform targetToScreenTransform = m_stack.back().target->renderSurface()->screenSpaceTransform();
         bool clipped;
         gfx::QuadF clipQuadInScreen = MathUtil::mapQuad(targetToScreenTransform, gfx::QuadF(clipRectInTarget), clipped);
         // FIXME: Find a rect interior to the transformed clip quad.
@@ -320,7 +320,7 @@ void OcclusionTrackerBase<LayerType, RenderSurfaceType>::markOccludedBehindLayer
     }
 }
 
-static inline bool testContentRectOccluded(const gfx::Rect& contentRect, const WebTransformationMatrix& contentSpaceTransform, const gfx::Rect& clipRectInTarget, const Region& occlusion)
+static inline bool testContentRectOccluded(const gfx::Rect& contentRect, const Transform& contentSpaceTransform, const gfx::Rect& clipRectInTarget, const Region& occlusion)
 {
     gfx::RectF transformedRect = MathUtil::mapClippedRect(contentSpaceTransform, gfx::RectF(contentRect));
     // Take the gfx::ToEnclosingRect, as we want to include partial pixels in the test.
@@ -329,7 +329,7 @@ static inline bool testContentRectOccluded(const gfx::Rect& contentRect, const W
 }
 
 template<typename LayerType, typename RenderSurfaceType>
-bool OcclusionTrackerBase<LayerType, RenderSurfaceType>::occluded(const LayerType* renderTarget, const gfx::Rect& contentRect, const WebKit::WebTransformationMatrix& drawTransform, bool implDrawTransformIsUnknown, const gfx::Rect& clippedRectInTarget, bool* hasOcclusionFromOutsideTargetSurface) const
+bool OcclusionTrackerBase<LayerType, RenderSurfaceType>::occluded(const LayerType* renderTarget, const gfx::Rect& contentRect, const gfx::Transform& drawTransform, bool implDrawTransformIsUnknown, const gfx::Rect& clippedRectInTarget, bool* hasOcclusionFromOutsideTargetSurface) const
 {
     if (hasOcclusionFromOutsideTargetSurface)
         *hasOcclusionFromOutsideTargetSurface = false;
@@ -368,21 +368,21 @@ static inline gfx::Rect rectSubtractRegion(const gfx::Rect& rect, const Region&
     return rectRegion.bounds();
 }
 
-static inline gfx::Rect computeUnoccludedContentRect(const gfx::Rect& contentRect, const WebTransformationMatrix& contentSpaceTransform, const gfx::Rect& clipRectInTarget, const Region& occlusion)
+static inline gfx::Rect computeUnoccludedContentRect(const gfx::Rect& contentRect, const Transform& contentSpaceTransform, const gfx::Rect& clipRectInTarget, const Region& occlusion)
 {
-    if (!contentSpaceTransform.isInvertible())
+    if (!contentSpaceTransform.IsInvertible())
         return contentRect;
 
     // Take the ToEnclosingRect at each step, as we want to contain any unoccluded partial pixels in the resulting Rect.
     gfx::RectF transformedRect = MathUtil::mapClippedRect(contentSpaceTransform, gfx::RectF(contentRect));
     gfx::Rect shrunkRect = rectSubtractRegion(gfx::IntersectRects(gfx::ToEnclosingRect(transformedRect), clipRectInTarget), occlusion);
-    gfx::Rect unoccludedRect = gfx::ToEnclosingRect(MathUtil::projectClippedRect(contentSpaceTransform.inverse(), gfx::RectF(shrunkRect)));
+    gfx::Rect unoccludedRect = gfx::ToEnclosingRect(MathUtil::projectClippedRect(MathUtil::inverse(contentSpaceTransform), gfx::RectF(shrunkRect)));
     // The rect back in content space is a bounding box and may extend outside of the original contentRect, so clamp it to the contentRectBounds.
     return gfx::IntersectRects(unoccludedRect, contentRect);
 }
 
 template<typename LayerType, typename RenderSurfaceType>
-gfx::Rect OcclusionTrackerBase<LayerType, RenderSurfaceType>::unoccludedContentRect(const LayerType* renderTarget, const gfx::Rect& contentRect, const WebKit::WebTransformationMatrix& drawTransform, bool implDrawTransformIsUnknown, const gfx::Rect& clippedRectInTarget, bool* hasOcclusionFromOutsideTargetSurface) const
+gfx::Rect OcclusionTrackerBase<LayerType, RenderSurfaceType>::unoccludedContentRect(const LayerType* renderTarget, const gfx::Rect& contentRect, const gfx::Transform& drawTransform, bool implDrawTransformIsUnknown, const gfx::Rect& clippedRectInTarget, bool* hasOcclusionFromOutsideTargetSurface) const
 {
     DCHECK(!m_stack.empty());
     if (m_stack.empty())
@@ -439,8 +439,8 @@ gfx::Rect OcclusionTrackerBase<LayerType, RenderSurfaceType>::unoccludedContribu
     // found just below the top of the stack (if it exists).
     bool hasOcclusion = m_stack.size() > 1;
 
-    const WebTransformationMatrix& transformToScreen = forReplica ? surface->replicaScreenSpaceTransform() : surface->screenSpaceTransform();
-    const WebTransformationMatrix& transformToTarget = forReplica ? surface->replicaDrawTransform() : surface->drawTransform();
+    const Transform& transformToScreen = forReplica ? surface->replicaScreenSpaceTransform() : surface->screenSpaceTransform();
+    const Transform& transformToTarget = forReplica ? surface->replicaDrawTransform() : surface->drawTransform();
 
     gfx::Rect unoccludedInScreen = contentRect;
     if (surfaceTransformsToScreenKnown(surface)) {