Add UMA statistics to the clipboard

ui/base/clipboard/clipboard_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/clipboard/clipboard.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
@@ skipping 275 matching lines @@
   if ([[pb types] containsObject:kWebCustomDataPboardType]) {
     NSData* data = [pb dataForType:kWebCustomDataPboardType];
     if ([data length])
       ReadCustomDataTypes([data bytes], [data length], types);
   }
 }
 
 void Clipboard::ReadText(Clipboard::Buffer buffer, string16* result) const {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(buffer, BUFFER_STANDARD);
+  ReportAction(buffer, READ_TEXT);
   NSPasteboard* pb = GetPasteboard();
   NSString* contents = [pb stringForType:NSStringPboardType];
 
   UTF8ToUTF16([contents UTF8String],
               [contents lengthOfBytesUsingEncoding:NSUTF8StringEncoding],
               result);
 }
 
 void Clipboard::ReadAsciiText(Clipboard::Buffer buffer,
                               std::string* result) const {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(buffer, BUFFER_STANDARD);
+  ReportAction(buffer, READ_TEXT);
   NSPasteboard* pb = GetPasteboard();
   NSString* contents = [pb stringForType:NSStringPboardType];
 
   if (!contents)
     result->clear();
   else
     result->assign([contents UTF8String]);
 }
 
 void Clipboard::ReadHTML(Clipboard::Buffer buffer, string16* markup,
@@ skipping 23 matching lines @@
   }
 
   *fragment_start = 0;
   DCHECK(markup->length() <= kuint32max);
   *fragment_end = static_cast<uint32>(markup->length());
 }
 
 void Clipboard::ReadRTF(Buffer buffer, std::string* result) const {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(buffer, BUFFER_STANDARD);
+  ReportAction(buffer, READ_TEXT);
 
   return ReadData(GetRtfFormatType(), result);
 }
 
 SkBitmap Clipboard::ReadImage(Buffer buffer) const {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(buffer, BUFFER_STANDARD);
 
   scoped_nsobject<NSImage> image(
       [[NSImage alloc] initWithPasteboard:GetPasteboard()]);
@@ skipping 144 matching lines @@
   return type;
 }
 
 // static
 const Clipboard::FormatType& Clipboard::GetSourceTagFormatType() {
   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kSourceTagPboardType));
   return type;
 }
 
 }  // namespace ui