Move a few media controls elements into modules/media_controls/elements/.

third_party/WebKit/Source/modules/media_controls/BUILD.gn

Index: third_party/WebKit/Source/modules/media_controls/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/media_controls/BUILD.gn b/third_party/WebKit/Source/modules/media_controls/BUILD.gn
index 100d696cba01c8c8c8e321c355fe24f7ec315ed2..406b4a9c032aa1c6e5ce7b24fdaa2ce1efbad599 100644
--- a/third_party/WebKit/Source/modules/media_controls/BUILD.gn
+++ b/third_party/WebKit/Source/modules/media_controls/BUILD.gn
@@ -14,5 +14,11 @@ blink_modules_sources("media_controls") {
     "MediaControlsOrientationLockDelegate.h",
     "MediaControlsWindowEventListener.cpp",
     "MediaControlsWindowEventListener.h",
+    "elements/MediaControlMuteButtonElement.cpp",

[whywhat, 2017/04/10 17:50:47]

nit: why do you think having a separate subdir for elements is justified?
I'd err on keeping the directory depth as low as possible

[mlamouri (slow - plz ping), 2017/04/10 19:07:23]

There will likely be around a dozen elements in there and that number will grow.
I'm worried that it would pollute the top directory. +haraken@ to see what he
thinks.

+    "elements/MediaControlMuteButtonElement.h",
+    "elements/MediaControlOverlayEnclosureElement.cpp",
+    "elements/MediaControlOverlayEnclosureElement.h",
+    "elements/MediaControlPanelEnclosureElement.cpp",
+    "elements/MediaControlPanelEnclosureElement.h",
   ]
 }