remove WEB_ANIMATION_SUPPORTS_FULL_DIRECTION guards

This is the 3rd part accelerated direction control.

The legacy code was handling alternatesdirection instead of the full set
of direction controls.

Now that blink side has landed, we can remove this legacy code.

It builds on top of https://codereview.chromium.org/227733004 and
https://codereview.chromium.org/225183014

BUG=348071

Review URL: https://codereview.chromium.org/576553002

Cr-Commit-Position: refs/heads/master@{#294965}

cc/blink/web_animation_impl.cc

@@ -114,7 +114,6 @@ void WebCompositorAnimationImpl::setTimeOffset(double monotonic_time) {
   animation_->set_time_offset(base::TimeDelta::FromSecondsD(monotonic_time));
 }
 
-#if WEB_ANIMATION_SUPPORTS_FULL_DIRECTION
 blink::WebCompositorAnimation::Direction WebCompositorAnimationImpl::direction()
     const {
   switch (animation_->direction()) {
@@ -148,18 +147,6 @@ void WebCompositorAnimationImpl::setDirection(Direction direction) {
       break;
   }
 }
-#else
-bool WebCompositorAnimationImpl::alternatesDirection() const {
-  return animation_->direction() == cc::Animation::Alternate;
-}
-
-void WebCompositorAnimationImpl::setAlternatesDirection(bool alternates) {
-  if (alternates)
-    animation_->set_direction(cc::Animation::Alternate);
-  else
-    animation_->set_direction(cc::Animation::Normal);
-}
-#endif
 
 double WebCompositorAnimationImpl::playbackRate() const {
   return animation_->playback_rate();

cc/blink/web_animation_impl.h

@@ -42,13 +42,8 @@ class WebCompositorAnimationImpl : public blink::WebCompositorAnimation {
   virtual void setStartTime(double monotonic_time);
   virtual double timeOffset() const;
   virtual void setTimeOffset(double monotonic_time);
-#if WEB_ANIMATION_SUPPORTS_FULL_DIRECTION
   virtual Direction direction() const;
   virtual void setDirection(Direction);
-#else
-  virtual bool alternatesDirection() const;
-  virtual void setAlternatesDirection(bool alternates);
-#endif
   virtual double playbackRate() const;
   virtual void setPlaybackRate(double playback_rate);
 

cc/blink/web_animation_unittest.cc

@@ -24,11 +24,7 @@ TEST(WebCompositorAnimationTest, DefaultSettings) {
   EXPECT_EQ(1, animation->iterations());
   EXPECT_EQ(0, animation->startTime());
   EXPECT_EQ(0, animation->timeOffset());
-#if WEB_ANIMATION_SUPPORTS_FULL_DIRECTION
   EXPECT_EQ(WebCompositorAnimation::DirectionNormal, animation->direction());
-#else
-  EXPECT_FALSE(animation->alternatesDirection());
-#endif
 }
 
 TEST(WebCompositorAnimationTest, ModifiedSettings) {
@@ -38,22 +34,12 @@ TEST(WebCompositorAnimationTest, ModifiedSettings) {
   animation->setIterations(2);
   animation->setStartTime(2);
   animation->setTimeOffset(2);
-#if WEB_ANIMATION_SUPPORTS_FULL_DIRECTION
   animation->setDirection(WebCompositorAnimation::DirectionReverse);
-#else
-  animation->setAlternatesDirection(true);
-#endif
 
   EXPECT_EQ(2, animation->iterations());
   EXPECT_EQ(2, animation->startTime());
   EXPECT_EQ(2, animation->timeOffset());
-#if WEB_ANIMATION_SUPPORTS_FULL_DIRECTION
   EXPECT_EQ(WebCompositorAnimation::DirectionReverse, animation->direction());
-#else
-  EXPECT_TRUE(animation->alternatesDirection());
-  animation->setAlternatesDirection(false);
-  EXPECT_FALSE(animation->alternatesDirection());
-#endif
 }
 
 }  // namespace