Expose a seekable range at 0 for streaming sources with duration.

content/renderer/media/android/webmediaplayer_android.cc

Index: content/renderer/media/android/webmediaplayer_android.cc
diff --git a/content/renderer/media/android/webmediaplayer_android.cc b/content/renderer/media/android/webmediaplayer_android.cc
index 32f81d15cd5a7221a8bb2de54c6e054d64d4fd4a..a914e7ffc6dc334e666e07a79ba08b8fb57247be 100644
--- a/content/renderer/media/android/webmediaplayer_android.cc
+++ b/content/renderer/media/android/webmediaplayer_android.cc
@@ -11,6 +11,7 @@
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
+#include "base/float_util.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
@@ -525,11 +526,12 @@ blink::WebTimeRanges WebMediaPlayerAndroid::seekable() const {
   if (ready_state_ < WebMediaPlayer::ReadyStateHaveMetadata)
     return blink::WebTimeRanges();
 
-  // If we have a duration then use [0, duration] as the seekable range.
+  // Media without duration are considered streaming and should not be seekable.
   const double seekable_end = duration();
-  if (!seekable_end)
+  if (!base::IsFinite(seekable_end))

[philipj_slow, 2014/10/01 09:37:50]

With this change I believe you can remove the readyState check above, because
duration() already returns NaN for that case.

[DaleCurtis, 2014/10/06 23:55:42]

Done.

     return blink::WebTimeRanges();
 
+  // If we have a finite duration then use [0, duration] as the seekable range.
   blink::WebTimeRange seekable_range(0.0, seekable_end);
   return blink::WebTimeRanges(&seekable_range, 1);
 }