Clear the clipboard closing Incognito window

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 94d78712f26c6c6e629b33513e43ffd1831224d1..87cf29cef82a4d28921e7a116e84d91a723a3067 100644
--- a/ui/base/clipboard/clipboard.h
+++ b/ui/base/clipboard/clipboard.h
@@ -11,6 +11,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
+#include "base/observer_list.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
@@ -132,6 +133,7 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
     CBF_BITMAP,
     CBF_SMBITMAP,  // Bitmap from shared memory.
     CBF_DATA,  // Arbitrary block of bytes.
+    CBF_INCOGNITO_MARKER, // Signifies that data came from Incognito mode.
   };
 
   // ObjectMap is a map from ObjectType to associated data.
@@ -162,6 +164,8 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   //               size         gfx::Size struct
   // CBF_DATA      format       char array
   //               data         byte array
+  // CBF_INCOGNITO_MARKER
+  //               data         byte array
   typedef std::vector<char> ObjectMapParam;
   typedef std::vector<ObjectMapParam> ObjectMapParams;
   typedef std::map<int /* ObjectType */, ObjectMapParams> ObjectMap;
@@ -174,6 +178,22 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
     BUFFER_SELECTION,
   };
 
+  class ClipboardObserver {
+   public:
+    // Called at the end of Clipboard::WriteObjects()
+    virtual void OnWriteObjects(Buffer buffer) = 0;
+   protected:
+    virtual ~ClipboardObserver() {}
+  };
+
+  void AddObserver(ClipboardObserver* obs) {
+    observer_list_.AddObserver(obs);
+  }
+
+  void RemoveObserver(ClipboardObserver* obs) {
+    observer_list_.RemoveObserver(obs);
+  }
+
   static bool IsValidBuffer(int32 buffer) {
     switch (buffer) {
       case BUFFER_STANDARD:
@@ -280,6 +300,7 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   // crbug.com/158399.
   static const FormatType& GetWebCustomDataFormatType();
   static const FormatType& GetPepperCustomDataFormatType();
+  static const FormatType& GetIncognitoMarkerFormatType();
 
   // Embeds a pointer to a SharedMemory object pointed to by |bitmap_handle|
   // belonging to |process| into a shared bitmap [CBF_SMBITMAP] slot in
@@ -307,6 +328,8 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
 
   void DispatchObject(ObjectType type, const ObjectMapParams& params);
 
+  void WriteObjectsImpl(Buffer buffer, const ObjectMap& objects);
+
   void WriteText(const char* text_data, size_t text_len);
 
   void WriteHTML(const char* markup_data,
@@ -382,6 +405,7 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   class AuraX11Details;
   scoped_ptr<AuraX11Details> aurax11_details_;
 #endif
+  ObserverList<ClipboardObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(Clipboard);
 };