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 c85b90adcd20319bc78d5e1bfe9c046d5db59cbe..873afcf06f0874961074d07826cab80016de9614 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"
@@ -135,6 +136,7 @@ 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_SOURCE_TAG, // Signifies the source of data.
   };
 
   // ObjectMap is a map from ObjectType to associated data.
@@ -169,6 +171,12 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   typedef std::vector<ObjectMapParam> ObjectMapParams;
   typedef std::map<int /* ObjectType */, ObjectMapParams> ObjectMap;
 
+  // WriteObject() caller can use the SourceTag that will be stored in the
+  // clipboard. NULL value means "no tag".
+  typedef void* SourceTag;
+  static ObjectMapParam SourceTag2Binary(SourceTag tag);
+  static SourceTag Binary2SourceTag(const std::string& serialization);
+
   // Buffer designates which clipboard the action should be applied to.
   // Only platforms that use the X Window System support the selection
   // buffer.
@@ -177,6 +185,24 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
     BUFFER_SELECTION,
   };
 
+  // This observer does track only calls to Clipboard::WriteObjects.
+  // Don't use it for notification about changed OS clipboard.
+  class ClipboardObserverForTesting {
+   public:
+    // Called at the end of Clipboard::WriteObjects().
+    virtual void OnWriteObjects(Buffer buffer) = 0;
+   protected:
+    virtual ~ClipboardObserverForTesting() {}
+  };
+
+  void AddObserver(ClipboardObserverForTesting* obs) {
+    observer_list_.AddObserver(obs);
+  }
+
+  void RemoveObserver(ClipboardObserverForTesting* obs) {
+    observer_list_.RemoveObserver(obs);
+  }
+
   static bool IsValidBuffer(int32 buffer) {
     switch (buffer) {
       case BUFFER_STANDARD:
@@ -214,7 +240,9 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   // contents of |objects|. On Windows they are copied to the system clipboard.
   // On linux they are copied into a structure owned by the Clipboard object and
   // kept until the system clipboard is set again.
-  void WriteObjects(Buffer buffer, const ObjectMap& objects);
+  // SourceTag is optional value to be stored in the clipboard, NULL won't be
+  // stored.
+  void WriteObjects(Buffer buffer, const ObjectMap& objects, SourceTag tag);
 
   // Returns a sequence number which uniquely identifies clipboard state.
   // This can be used to version the data on the clipboard and determine
@@ -261,6 +289,9 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   // as a byte vector.
   void ReadData(const FormatType& format, std::string* result) const;
 
+  // Reads Source tag from the clipboard, if available.
+  SourceTag ReadSourceTag() const;
+
   // Gets the FormatType corresponding to an arbitrary format string,
   // registering it with the system if needed. Due to Windows/Linux
   // limitiations, |format_string| must never be controlled by the user.
@@ -283,6 +314,7 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   // crbug.com/158399.
   static const FormatType& GetWebCustomDataFormatType();
   static const FormatType& GetPepperCustomDataFormatType();
+  static const FormatType& GetSourceTagFormatType();
 
   // Embeds a pointer to a SharedMemory object pointed to by |bitmap_handle|
   // belonging to |process| into a shared bitmap [CBF_SMBITMAP] slot in
@@ -310,6 +342,8 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
 
   void DispatchObject(ObjectType type, const ObjectMapParams& params);
 
+  void WriteObjectsImpl(Buffer buffer, const ObjectMap& objects, SourceTag tag);
+
   void WriteText(const char* text_data, size_t text_len);
 
   void WriteHTML(const char* markup_data,
@@ -331,6 +365,8 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   void WriteData(const FormatType& format,
                  const char* data_data,
                  size_t data_len);
+
+  void WriteSourceTag(SourceTag tag);
 #if defined(OS_WIN)
   void WriteBitmapFromHandle(HBITMAP source_hbitmap,
                              const gfx::Size& size);
@@ -385,6 +421,7 @@ class UI_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
   class AuraX11Details;
   scoped_ptr<AuraX11Details> aurax11_details_;
 #endif
+  ObserverList<ClipboardObserverForTesting> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(Clipboard);
 };