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

cc/math_util.h

Index: cc/math_util.h
diff --git a/cc/math_util.h b/cc/math_util.h
index 65fb436a02c314d25a8b83874f18695a4478759b..99ee46cfd8dda88c03f208a72a20945cee72ea67 100644
--- a/cc/math_util.h
+++ b/cc/math_util.h
@@ -11,14 +11,11 @@
 #include "ui/gfx/point3_f.h"
 #include "ui/gfx/transform.h"
 
-namespace WebKit {
-class WebTransformationMatrix;
-}
-
 namespace gfx {
 class QuadF;
 class Rect;
 class RectF;
+class Transform;
 class Vector2dF;
 }
 
@@ -78,7 +75,7 @@ public:
     static float Deg2Rad(float deg)  { return deg * PI_FLOAT / 180; }
     static float Rad2Deg(float rad)  { return rad * 180 / PI_FLOAT; }
 
-    // Background: WebTransformationMatrix code in WebCore does not do the right thing in
+    // Background: Existing transform code does not do the right thing in
     // mapRect / mapQuad / projectQuad when there is a perspective projection that causes
     // one of the transformed vertices to go to w < 0. In those cases, it is necessary to
     // perform clipping in homogeneous coordinates, after applying the transform, before
@@ -86,30 +83,30 @@ public:
     //
     // These functions return the axis-aligned rect that encloses the correctly clipped,
     // transformed polygon.
-    static gfx::Rect mapClippedRect(const WebKit::WebTransformationMatrix&, const gfx::Rect&);
-    static gfx::RectF mapClippedRect(const WebKit::WebTransformationMatrix&, const gfx::RectF&);
-    static gfx::RectF projectClippedRect(const WebKit::WebTransformationMatrix&, const gfx::RectF&);
+    static gfx::Rect mapClippedRect(const gfx::Transform&, const gfx::Rect&);
+    static gfx::RectF mapClippedRect(const gfx::Transform&, const gfx::RectF&);
+    static gfx::RectF projectClippedRect(const gfx::Transform&, const gfx::RectF&);
 
     // Returns an array of vertices that represent the clipped polygon. After returning, indexes from
     // 0 to numVerticesInClippedQuad are valid in the clippedQuad array. Note that
     // numVerticesInClippedQuad may be zero, which means the entire quad was clipped, and
     // none of the vertices in the array are valid.
-    static void mapClippedQuad(const WebKit::WebTransformationMatrix&, const gfx::QuadF& srcQuad, gfx::PointF clippedQuad[8], int& numVerticesInClippedQuad);
+    static void mapClippedQuad(const gfx::Transform&, const gfx::QuadF& srcQuad, gfx::PointF clippedQuad[8], int& numVerticesInClippedQuad);
 
     static gfx::RectF computeEnclosingRectOfVertices(gfx::PointF vertices[], int numVertices);
     static gfx::RectF computeEnclosingClippedRect(const HomogeneousCoordinate& h1, const HomogeneousCoordinate& h2, const HomogeneousCoordinate& h3, const HomogeneousCoordinate& h4);
 
     // NOTE: These functions do not do correct clipping against w = 0 plane, but they
     // correctly detect the clipped condition via the boolean clipped.
-    static gfx::QuadF mapQuad(const WebKit::WebTransformationMatrix&, const gfx::QuadF&, bool& clipped);
-    static gfx::PointF mapPoint(const WebKit::WebTransformationMatrix&, const gfx::PointF&, bool& clipped);
-    static gfx::Point3F mapPoint(const WebKit::WebTransformationMatrix&, const gfx::Point3F&, bool& clipped);
-    static gfx::QuadF projectQuad(const WebKit::WebTransformationMatrix&, const gfx::QuadF&, bool& clipped);
-    static gfx::PointF projectPoint(const WebKit::WebTransformationMatrix&, const gfx::PointF&, bool& clipped);
+    static gfx::QuadF mapQuad(const gfx::Transform&, const gfx::QuadF&, bool& clipped);
+    static gfx::PointF mapPoint(const gfx::Transform&, const gfx::PointF&, bool& clipped);
+    static gfx::Point3F mapPoint(const gfx::Transform&, const gfx::Point3F&, bool& clipped);
+    static gfx::QuadF projectQuad(const gfx::Transform&, const gfx::QuadF&, bool& clipped);
+    static gfx::PointF projectPoint(const gfx::Transform&, const gfx::PointF&, bool& clipped);
 
-    static void flattenTransformTo2d(WebKit::WebTransformationMatrix&);
+    static void flattenTransformTo2d(gfx::Transform&);
 
-    static gfx::Vector2dF computeTransform2dScaleComponents(const WebKit::WebTransformationMatrix&);
+    static gfx::Vector2dF computeTransform2dScaleComponents(const gfx::Transform&);
 
     // Returns the smallest angle between the given two vectors in degrees. Neither vector is
     // assumed to be normalized.
@@ -118,17 +115,14 @@ public:
     // Projects the |source| vector onto |destination|. Neither vector is assumed to be normalized.
     static gfx::Vector2dF projectVector(gfx::Vector2dF source, gfx::Vector2dF destination);
 
-    // Temporary API to ease migration from WebKit::WebTransformationMatrix
+    // Temporary API to ease migration from gfx::Transform
     // to gfx::Transform.
     //
     // TODO(shawnsingh, vollick) we should phase out as much as possible of
     // these temporary functions, putting functionality into gfx::Transform.
-    static bool isInvertible(const gfx::Transform&);
     static bool isBackFaceVisible(const gfx::Transform&);
-    static bool isIdentity(const gfx::Transform&);
     static bool isIdentityOrTranslation(const gfx::Transform&);
     static bool hasPerspective(const gfx::Transform&);
-    static void makeIdentity(gfx::Transform*);
     static void rotateEulerAngles(gfx::Transform*, double eulerX, double eulerY, double eulerZ);
     static void rotateAxisAngle(gfx::Transform*, double i, double j, double k, double degrees);
     static gfx::Transform inverse(const gfx::Transform&);