Add Matrix4x3 and tristimulus class to color utiliies.

ui/gfx/color_utils_unittest.cc

Index: ui/gfx/color_utils_unittest.cc
diff --git a/ui/gfx/color_utils_unittest.cc b/ui/gfx/color_utils_unittest.cc
index 2993fe45a5d122e19f60b796c9bb7dfd5eec5691..584790a3fb7d01a631e30d35a518ea9ce009cd22 100644
--- a/ui/gfx/color_utils_unittest.cc
+++ b/ui/gfx/color_utils_unittest.cc
@@ -165,4 +165,31 @@ TEST(ColorUtils, AlphaBlend) {
   EXPECT_EQ(0U, SkColorGetA(AlphaBlend(fore, back, 255)));
 }
 
+TEST(ColorUtils, Matrix4x3) {
+  Matrix4x3 tmp;
+  EXPECT_EQ(tmp.lookup(3, 3), 1.0f);
+  tmp.rows[0][2] = 4.0f;
+  tmp.rows[2][1] = 8.0f;
+  Matrix4x3 copy = tmp.Invert().Invert();
+  EXPECT_EQ(tmp.rows[0][2], 4.0f);
+  EXPECT_EQ(tmp.rows[2][1], 8.0f);
+  for (int row = 0; row < 3; row++) {
+    for (int col = 0; col < 4; col++) {
+      copy.rows[row][col] = 0.0f;
+    }
+  }
+  copy = copy * tmp;
+  for (int row = 0; row < 3; row++) {
+    for (int col = 0; col < 4; col++) {
+      EXPECT_EQ(copy.lookup(row, col), 0.0f);
+    }
+  }
+
+  TriStim tmp2(1.0f, 2.0f, 3.0f);
+  tmp2 = copy * tmp2;
+  EXPECT_EQ(tmp2.values[0], 0.0f);
+  EXPECT_EQ(tmp2.values[1], 0.0f);
+  EXPECT_EQ(tmp2.values[2], 0.0f);
+}
+
 }  // namespace color_utils