Expose text track settings in Content and implement for Android

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index 72eb2f452eb456366ec24113989a08dc27111bf1..8a4fb0c3d2a45029db222d5bfa051d74aeb36b09 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -275,6 +275,29 @@ IPC_STRUCT_BEGIN(FrameHostMsg_OpenURL_Params)
   IPC_STRUCT_MEMBER(bool, user_gesture)
 IPC_STRUCT_END()
 
+IPC_STRUCT_BEGIN(FrameMsg_TextTrackSettings_Params)
+  // Background color of the text track.
+  IPC_STRUCT_MEMBER(std::string, text_track_background_color)
+
+  // Font family of the text track text.
+  IPC_STRUCT_MEMBER(std::string, text_track_font_family)
+
+  // Font style of the text track text.
+  IPC_STRUCT_MEMBER(std::string, text_track_font_style)
+
+  // Font variant of the text track text.
+  IPC_STRUCT_MEMBER(std::string, text_track_font_variant)
+
+  // Color of the text track text.
+  IPC_STRUCT_MEMBER(std::string, text_track_text_color)
+
+  // Text shadow (edge style) of the text track text.
+  IPC_STRUCT_MEMBER(std::string, text_track_text_shadow)
+
+  // Size of the text track text.
+  IPC_STRUCT_MEMBER(std::string, text_track_text_size)
+IPC_STRUCT_END()
+
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
 // This message is used for supporting popup menus on Mac OS X and Android using
 // native controls. See the FrameHostMsg_ShowPopup message.
@@ -480,6 +503,11 @@ IPC_MESSAGE_ROUTED1(FrameMsg_DidUpdateSandboxFlags, content::SandboxFlags)
 // changed in another process.
 IPC_MESSAGE_ROUTED1(FrameMsg_DidUpdateName, std::string /* name */)
 
+// Send to the RenderFrame to set text track style settings.
+// Sent for top-level frames.
+IPC_MESSAGE_ROUTED1(FrameMsg_SetTextTrackSettings,
+                    FrameMsg_TextTrackSettings_Params /* params */)
+
 #if defined(OS_ANDROID)
 
 // External popup menus.