Use ParamTraits for media::BitstreamBuffer.

content/common/gpu/gpu_messages.cc

+// 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.
+
+#include "content/common/gpu/gpu_messages.h"
+
+namespace IPC {
+
+void ParamTraits<media::BitstreamBuffer>::Write(base::Pickle* m,
+                                                const param_type& p) {
+  DCHECK_GE(p.id(), 0);
+  DCHECK(base::SharedMemory::IsHandleValid(p.handle()));
+
+  WriteParam(m, p.id());
+  WriteParam(m, static_cast<uint64_t>(p.size()));
+  WriteParam(m, p.presentation_timestamp());
+  WriteParam(m, p.key_id());
+  if (!p.key_id().empty()) {
+    WriteParam(m, p.iv());
+    WriteParam(m, p.subsamples());
+  }
+  WriteParam(m, p.handle());
+}
+
+bool ParamTraits<media::BitstreamBuffer>::Read(const base::Pickle* m,
+                                               base::PickleIterator* iter,
+                                               param_type* r) {
+  DCHECK(r);
+  uint64_t size = 0;
+  if (!(ReadParam(m, iter, &r->id_) && ReadParam(m, iter, &size) &&
+        ReadParam(m, iter, &r->presentation_timestamp_) &&
+        ReadParam(m, iter, &r->key_id_)))
+    return false;
+
+  if (!base::IsValueInRangeForNumericType<size_t>(size)) {

[dcheng, 2016/02/18 21:06:09]

#include <stddef.h>

Also, I think it would be slightly more canonical to write this as:
CheckedNumeric<size_t> checked_size(size);
if (!checked_size.IsValid()) return false;
r->size_ = checked_size.ValueOrDie();

(which means including safe_math.h from //base/numerics)

[Owen Lin, 2016/02/23 03:40:11]

Done.

+    LOG(ERROR) << "Invalid size: " << size;

[dcheng, 2016/02/18 21:06:09]

#include "base/logging.h"

Also, let's make this (and other logging statements in this file) DLOG().

[Owen Lin, 2016/02/23 03:40:11]

Done.

+    return false;
+  }
+  r->size_ = static_cast<size_t>(size);
+
+  if (r->id_ < 0) {
+    LOG(ERROR) << "Invalid id: " << r->id_;
+    return false;
+  }
+  if (!r->key_id_.empty()) {
+    if (!(ReadParam(m, iter, &r->iv_) && ReadParam(m, iter, &r->subsamples_)))
+      return false;
+  }
+  if (!(ReadParam(m, iter, &r->handle_) &&
+        base::SharedMemory::IsHandleValid(r->handle_))) {
+    LOG(ERROR) << "fail to read valid handle.";
+    return false;
+  }
+  return true;
+}
+
+void ParamTraits<media::BitstreamBuffer>::Log(const param_type& p,
+                                              std::string* l) {
+  std::ostringstream oss;

[dcheng, 2016/02/18 21:06:09]

#include <sstream>

[Owen Lin, 2016/02/23 03:40:11]

Done.

+  oss << "id=" << p.id() << ", size=" << p.size() << ", presentation_timestamp="
+      << p.presentation_timestamp().ToInternalValue();
+  l->append(oss.str());
+}
+
+}  // namespace IPC