Add UMA statistics to the clipboard

ui/base/clipboard/clipboard_win.cc

Index: ui/base/clipboard/clipboard_win.cc
diff --git a/ui/base/clipboard/clipboard_win.cc b/ui/base/clipboard/clipboard_win.cc
index ce1bf0f03d990114fc6e964442857cbb9792705b..44e5d6f607587c27eb890b525705b69d0d7a7899 100644
--- a/ui/base/clipboard/clipboard_win.cc
+++ b/ui/base/clipboard/clipboard_win.cc
@@ -437,6 +437,7 @@ void Clipboard::ReadAvailableTypes(Clipboard::Buffer buffer,
 
 void Clipboard::ReadText(Clipboard::Buffer buffer, string16* result) const {
   DCHECK_EQ(buffer, BUFFER_STANDARD);
+  ReportAction(buffer, READ_TEXT);
   if (!result) {
     NOTREACHED();
     return;
@@ -460,6 +461,7 @@ void Clipboard::ReadText(Clipboard::Buffer buffer, string16* result) const {
 void Clipboard::ReadAsciiText(Clipboard::Buffer buffer,
                               std::string* result) const {
   DCHECK_EQ(buffer, BUFFER_STANDARD);
+  ReportAction(buffer, READ_ASCII_TEXT);
   if (!result) {
     NOTREACHED();
     return;
@@ -532,6 +534,7 @@ void Clipboard::ReadHTML(Clipboard::Buffer buffer, string16* markup,
 
 void Clipboard::ReadRTF(Buffer buffer, std::string* result) const {
   DCHECK_EQ(buffer, BUFFER_STANDARD);
+  ReportAction(buffer, READ_RTF);
 
   ReadData(GetRtfFormatType(), result);
 }