cc: Turn SharedQuadState into a struct-like class similar to DrawQuads.

cc/render_surface_unittest.cc

Index: cc/render_surface_unittest.cc
diff --git a/cc/render_surface_unittest.cc b/cc/render_surface_unittest.cc
index 14d8e595736670ce7fb351a7984a0ce116c48562..bc5b78f175780f48171031ea5aa6c38e2822f310 100644
--- a/cc/render_surface_unittest.cc
+++ b/cc/render_surface_unittest.cc
@@ -103,9 +103,9 @@ TEST(RenderSurfaceTest, sanityCheckSurfaceCreatesCorrectSharedQuadState)
     ASSERT_EQ(1u, sharedStateList.size());
     SharedQuadState* sharedQuadState = sharedStateList[0];
 
-    EXPECT_EQ(30, sharedQuadState->quadTransform.m41());
-    EXPECT_EQ(40, sharedQuadState->quadTransform.m42());
-    EXPECT_RECT_EQ(contentRect, gfx::Rect(sharedQuadState->visibleContentRect));
+    EXPECT_EQ(30, sharedQuadState->content_to_target_transform.m41());
+    EXPECT_EQ(40, sharedQuadState->content_to_target_transform.m42());
+    EXPECT_RECT_EQ(contentRect, gfx::Rect(sharedQuadState->visible_content_rect));
     EXPECT_EQ(1, sharedQuadState->opacity);
 }