Pass gfx structs by const ref (gfx::Vector2d/F)

ui/events/gesture_detection/velocity_tracker_unittest.cc

Index: ui/events/gesture_detection/velocity_tracker_unittest.cc
diff --git a/ui/events/gesture_detection/velocity_tracker_unittest.cc b/ui/events/gesture_detection/velocity_tracker_unittest.cc
index 7bcf75c82c5343bfbdb75eb741a67e61d11b0e23..215d93e34ce6803849f1a32821b7af6d059c897a 100644
--- a/ui/events/gesture_detection/velocity_tracker_unittest.cc
+++ b/ui/events/gesture_detection/velocity_tracker_unittest.cc
@@ -50,7 +50,7 @@ class VelocityTrackerTest : public testing::Test {
   static MockMotionEvent Sample(MotionEvent::Action action,
                                 const gfx::PointF& p0,
                                 TimeTicks t0,
-                                gfx::Vector2dF v,
+                                const gfx::Vector2dF& v,
                                 TimeDelta dt) {
     const gfx::PointF p = p0 + ScaleVector2d(v, dt.InSecondsF());
     return MockMotionEvent(action, t0 + dt, p.x(), p.y());
@@ -58,7 +58,7 @@ class VelocityTrackerTest : public testing::Test {
 
   static void ApplyMovementSequence(VelocityTrackerState* state,
                                     const gfx::PointF& p0,
-                                    gfx::Vector2dF v,
+                                    const gfx::Vector2dF& v,
                                     TimeTicks t0,
                                     TimeDelta t,
                                     size_t samples) {
@@ -73,7 +73,7 @@ class VelocityTrackerTest : public testing::Test {
 
   static void ApplyMovement(VelocityTrackerState* state,
                             const gfx::PointF& p0,
-                            gfx::Vector2dF v,
+                            const gfx::Vector2dF& v,
                             TimeTicks t0,
                             TimeDelta t,
                             size_t samples) {