Add stream operator for SurfaceId/FrameSinkId/LocalFrameId.

cc/surfaces/frame_sink_id.h

 // Copyright 2016 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.
 
 #ifndef CC_SURFACES_FRAME_SINK_ID_H_
 #define CC_SURFACES_FRAME_SINK_ID_H_
 
+#include <stdint.h>
+
+#include <iosfwd>
+#include <string>
 #include <tuple>
 
-#include "base/format_macros.h"
 #include "base/hash.h"
-#include "base/strings/stringprintf.h"
 
 namespace cc {
 
 class FrameSinkId {
  public:
   constexpr FrameSinkId() : client_id_(0), sink_id_(0) {}
 
   constexpr FrameSinkId(const FrameSinkId& other)
       : client_id_(other.client_id_), sink_id_(other.sink_id_) {}
 
@@ skipping 12 matching lines @@
 
   bool operator!=(const FrameSinkId& other) const { return !(*this == other); }
 
   bool operator<(const FrameSinkId& other) const {
     return std::tie(client_id_, sink_id_) <
            std::tie(other.client_id_, other.sink_id_);
   }
 
   size_t hash() const { return base::HashInts(client_id_, sink_id_); }
 
-  std::string ToString() const {
-    return base::StringPrintf("FrameSinkId(%d, %d)", client_id_, sink_id_);
-  }
+  std::string ToString() const;
 
  private:
   uint32_t client_id_;
   uint32_t sink_id_;
 };
 
+std::ostream& operator<<(std::ostream& out, const FrameSinkId& frame_sink_id);
+
 struct FrameSinkIdHash {
   size_t operator()(const FrameSinkId& key) const { return key.hash(); }
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_FRAME_SINK_ID_H_