Devtools Animations: Support multiple frames in the animation timeline

Source/core/inspector/InspectorAnimationAgent.cpp

Index: Source/core/inspector/InspectorAnimationAgent.cpp
diff --git a/Source/core/inspector/InspectorAnimationAgent.cpp b/Source/core/inspector/InspectorAnimationAgent.cpp
index 99fc461a20b4b78d794c9eb5446dd2b0457b2d81..65e01661d0cff44b8eefd8494e5c1cb49ac86706 100644
--- a/Source/core/inspector/InspectorAnimationAgent.cpp
+++ b/Source/core/inspector/InspectorAnimationAgent.cpp
@@ -171,6 +171,12 @@ static PassRefPtr<TypeBuilder::Animation::KeyframesRule> buildObjectForAnimation
     return keyframesObject.release();
 }
 
+static double normalizedStartTime(AnimationPlayer& player)
+{
+    ASSERT(player.timeline() && player.timeline()->playbackRate());
+    return player.startTime() / player.timeline()->playbackRate() + player.timeline()->zeroTime() * 1000;
+}
+
 PassRefPtr<TypeBuilder::Animation::AnimationPlayer> InspectorAnimationAgent::buildObjectForAnimationPlayer(AnimationPlayer& player)
 {
     // Find type of animation
@@ -208,7 +214,7 @@ PassRefPtr<TypeBuilder::Animation::AnimationPlayer> InspectorAnimationAgent::bui
         .setPausedState(player.paused())
         .setPlayState(player.playState())
         .setPlaybackRate(player.playbackRate())
-        .setStartTime(player.startTime())
+        .setStartTime(normalizedStartTime(player))
         .setCurrentTime(player.currentTime())
         .setSource(animationObject.release())
         .setType(animationType);
@@ -243,20 +249,61 @@ void InspectorAnimationAgent::getAnimationPlayersForNode(ErrorString* errorStrin
 
 void InspectorAnimationAgent::getPlaybackRate(ErrorString*, double* playbackRate)
 {
+    // All timelines should have the same playback rate
     *playbackRate = m_pageAgent->inspectedFrame()->document()->timeline().playbackRate();
 }
 
-void InspectorAnimationAgent::setPlaybackRate(ErrorString*, double playbackRate)
+void InspectorAnimationAgent::setPlaybackRate(ErrorString*, double playbackRate, RefPtr<TypeBuilder::Array<TypeBuilder::Animation::AnimationStartTime>>& animationStartTimes)
 {
     for (Frame* frame = m_pageAgent->inspectedFrame(); frame; frame = frame->tree().traverseNext(m_pageAgent->inspectedFrame())) {
         if (frame->isLocalFrame())
             toLocalFrame(frame)->document()->timeline().setPlaybackRate(playbackRate);
     }
+    animationStartTimes = buildArrayForStartTimes();
 }
 
-void InspectorAnimationAgent::setCurrentTime(ErrorString*, double currentTime)
+void InspectorAnimationAgent::seekTimelineTo(ErrorString* errorString, double time, RefPtr<TypeBuilder::Array<TypeBuilder::Animation::AnimationStartTime>>& animationStartTimes)
 {
-    m_pageAgent->inspectedFrame()->document()->timeline().setCurrentTime(currentTime);
+    if (!m_pageAgent->inspectedFrame()->document()->timeline().playbackRate()) {
+        *errorString = "Cannot set current time when timeline is paused";
+        return;
+    }
+    for (Frame* frame = m_pageAgent->inspectedFrame(); frame; frame = frame->tree().traverseNext(m_pageAgent->inspectedFrame())) {
+        if (frame->isLocalFrame()) {
+            AnimationTimeline& timeline = toLocalFrame(frame)->document()->timeline();
+            timeline.setCurrentTime((time - timeline.zeroTime() * 1000) * timeline.playbackRate());
+        }
+    }
+    animationStartTimes = buildArrayForStartTimes();
+}
+
+
+void InspectorAnimationAgent::seekTimelineBy(ErrorString* errorString, double timeDelta)
+{
+    if (m_pageAgent->inspectedFrame()->document()->timeline().playbackRate())
+        *errorString = "Cannot apply time delta when timeline is playing";
+    for (Frame* frame = m_pageAgent->inspectedFrame(); frame; frame = frame->tree().traverseNext(m_pageAgent->inspectedFrame())) {
+        if (frame->isLocalFrame()) {
+            AnimationTimeline& timeline = toLocalFrame(frame)->document()->timeline();
+            timeline.setCurrentTime(timeline.currentTime() + timeDelta);
+        }
+    }
+}
+
+PassRefPtr<TypeBuilder::Array<TypeBuilder::Animation::AnimationStartTime>> InspectorAnimationAgent::buildArrayForStartTimes()
+{
+    RefPtr<TypeBuilder::Array<TypeBuilder::Animation::AnimationStartTime>> animationStartTimes = TypeBuilder::Array<TypeBuilder::Animation::AnimationStartTime>::create();
+    if (!m_pageAgent->inspectedFrame()->document()->timeline().playbackRate())
+        return animationStartTimes.release();
+
+    for (const auto& pair : m_idToAnimationPlayer) {
+        const RefPtr<AnimationPlayer> player = pair.value;
+        RefPtr<TypeBuilder::Animation::AnimationStartTime> startTimeObject = TypeBuilder::Animation::AnimationStartTime::create()
+            .setId(pair.key)
+            .setStartTime(normalizedStartTime(*player.get()));
+        animationStartTimes->addItem(startTimeObject);
+    }
+    return animationStartTimes.release();
 }
 
 void InspectorAnimationAgent::setTiming(ErrorString* errorString, const String& playerId, double duration, double delay)
@@ -302,10 +349,10 @@ void InspectorAnimationAgent::didCreateAnimationPlayer(AnimationPlayer* player)
     // Check threshold
     double latestStartTime = 0;
     for (const auto& p : m_idToAnimationPlayer.values())
-        latestStartTime = max(latestStartTime, p->startTime());
+        latestStartTime = max(latestStartTime, normalizedStartTime(*p));
 
     bool reset = false;
-    if (player->startTime() - latestStartTime > 1000) {
+    if (normalizedStartTime(*player) - latestStartTime > 1000) {
         reset = true;
         m_idToAnimationPlayer.clear();
         m_idToAnimationType.clear();