Revert of Relanding 'Always notify the MediaPlayer of any seek' patch

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index 3de8b380eb9bfbbd0cf8922a62cc977d3314d733..b66d005d2036bb65fd77c490524267d19c0e3ea4 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -1995,6 +1995,7 @@
 
     // 4 - Set the seeking IDL attribute to true.
     // The flag will be cleared when the engine tells us the time has actually changed.
+    bool previousSeekStillPending = m_seeking;
     m_seeking = true;
 
     // 6 - If the new playback position is later than the end of the media resource, then let it be the end
@@ -2021,15 +2022,30 @@
     // attribute then set the seeking IDL attribute to false and abort these steps.
     RefPtrWillBeRawPtr<TimeRanges> seekableRanges = seekable();
 
-    if (!seekableRanges->length()) {
+    // Short circuit seeking to the current time by just firing the events if no seek is required.
+    // Don't skip calling the media engine if we are in poster mode because a seek should always
+    // cancel poster display.
+    bool noSeekRequired = !seekableRanges->length() || (time == now && displayMode() != Poster);
+
+    if (noSeekRequired) {
+        if (time == now) {
+            scheduleEvent(EventTypeNames::seeking);
+            if (previousSeekStillPending)
+                return;
+            // FIXME: There must be a stable state before timeupdate+seeked are dispatched and seeking
+            // is reset to false. See http://crbug.com/266631
+            scheduleTimeupdateEvent(false);
+            scheduleEvent(EventTypeNames::seeked);
+        }
         m_seeking = false;
         return;
     }
     time = seekableRanges->nearest(time, now);
 
-    if (m_playing && m_lastSeekTime < now)
-        addPlayedRange(m_lastSeekTime, now);
-
+    if (m_playing) {
+        if (m_lastSeekTime < now)
+            addPlayedRange(m_lastSeekTime, now);
+    }
     m_lastSeekTime = time;
     m_sentEndEvent = false;