Add UMA statistics to the clipboard

ui/base/clipboard/clipboard_gtk.cc

Index: ui/base/clipboard/clipboard_gtk.cc
diff --git a/ui/base/clipboard/clipboard_gtk.cc b/ui/base/clipboard/clipboard_gtk.cc
index 774393f98850d3d12adde35d1dd72660d0a5e365..5b8a4f069a4f0125bdc74415ca094b54e4adb3f4 100644
--- a/ui/base/clipboard/clipboard_gtk.cc
+++ b/ui/base/clipboard/clipboard_gtk.cc
@@ -463,6 +463,7 @@ void Clipboard::ReadAvailableTypes(Clipboard::Buffer buffer,
 
 void Clipboard::ReadText(Clipboard::Buffer buffer, string16* result) const {
   DCHECK(CalledOnValidThread());
+  ReportAction(buffer, READ_TEXT);
   GtkClipboard* clipboard = LookupBackingClipboard(buffer);
   if (clipboard == NULL)
     return;
@@ -481,6 +482,7 @@ void Clipboard::ReadText(Clipboard::Buffer buffer, string16* result) const {
 void Clipboard::ReadAsciiText(Clipboard::Buffer buffer,
                               std::string* result) const {
   DCHECK(CalledOnValidThread());
+  ReportAction(buffer, READ_ASCII_TEXT);
   GtkClipboard* clipboard = LookupBackingClipboard(buffer);
   if (clipboard == NULL)
     return;
@@ -542,6 +544,7 @@ void Clipboard::ReadHTML(Clipboard::Buffer buffer, string16* markup,
 
 void Clipboard::ReadRTF(Buffer buffer, std::string* result) const {
   DCHECK(CalledOnValidThread());
+  ReportAction(buffer, READ_RTF);
   ReadData(GetRtfFormatType(), result);
 }