Implement ui::ClipboardMus.

ui/base/clipboard/clipboard.h

Index: ui/base/clipboard/clipboard.h
diff --git a/ui/base/clipboard/clipboard.h b/ui/base/clipboard/clipboard.h
index 40af4df4f2fe2d1568227ee242f4118648c67d53..36ebe582d0d7455ed44524867385c59d4f1ce600 100644
--- a/ui/base/clipboard/clipboard.h
+++ b/ui/base/clipboard/clipboard.h
@@ -9,6 +9,7 @@
 #include <stdint.h>
 
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -60,9 +61,11 @@ class UI_BASE_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   static const char kMimeTypeText[];
   static const char kMimeTypeURIList[];
   static const char kMimeTypeDownloadURL[];
+  static const char kMimeTypeMozillaURL[];
   static const char kMimeTypeHTML[];
   static const char kMimeTypeRTF[];
   static const char kMimeTypePNG[];
+  static const char kMimeTypeWebCustomData[];

[sky, 2016/05/26 23:10:27]

Move over todo about removal?

[Elliot Glaysher, 2016/05/31 17:01:40]

The bug is closed and archived.

 
   // Platform neutral holder for native data representation of a clipboard type.
   struct UI_BASE_EXPORT FormatType {
@@ -137,6 +140,13 @@ class UI_BASE_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   static void SetAllowedThreads(
       const std::vector<base::PlatformThreadId>& allowed_threads);
 
+  // Builds the clipboard for the current thread. Previously, there was only

[sky, 2016/05/26 23:10:27]

This comment is a bit confusing. It's not building, it's setting, right?

+  // one clipboard implementation on a platform; now that mus exists, during
+  // mus app startup, we need to specifically initialize mus instead of the
+  // current platform clipboard. We take ownership of |platform_clipboard|. (We
+  // can't use unique_ptr since we don't want to expose the destructor.)

[sky, 2016/05/26 23:10:27]

Have this class friend unique_ptr? Alternatively take a unique_ptr to clarify
ownership but extract the Clipboard from it.

[Elliot Glaysher, 2016/05/31 17:01:40]

Done.

+  static void SetClipboardForCurrentThread(Clipboard* platform_clipboard);
+
   // Returns the clipboard object for the current thread.
   //
   // Most implementations will have at most one clipboard which will live on
@@ -311,6 +321,8 @@ class UI_BASE_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   friend class ScopedClipboardWriter;
   friend class TestClipboard;
 
+  static base::PlatformThreadId GetAndValidateThreadID();
+
   // A list of allowed threads. By default, this is empty and no thread checking
   // is done (in the unit test case), but a user (like content) can set which
   // threads are allowed to call this method.