Renamed the dns_prefetch component to network_predictor

This is in preparation for adding preconnect support which goes through
the same underlying plumbing.  dns_prefetch was too restrictive of a
component name and was only exposing the single method.

There are no functionality changes in this CL, just the rename (the namespace was also renamed)

BUG=450682

Review URL: https://codereview.chromium.org/848303005

Cr-Commit-Position: refs/heads/master@{#314001}

8 files changed, 203 insertions, 0 deletions

diff --git a/components/network_hints/common/BUILD.gn b/components/network_hints/common/BUILD.gn
new file mode 100644
index 0000000..1e06117
--- /dev/null
+++ b/components/network_hints/common/BUILD.gn
@@ -0,0 +1,19 @@
+# Copyright 2014 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.
+
+# GYP version: components/network_hints.gypi:predictor
+source_set("common") {
+  sources = [
+    "network_hints_common.cc",
+    "network_hints_common.h",
+    "network_hints_message_generator.cc",
+    "network_hints_message_generator.h",
+    "network_hints_messages.cc",
+    "network_hints_messages.h",
+  ]
+
+  deps = [
+    "//base",
+  ]
+}
diff --git a/components/network_hints/common/DEPS b/components/network_hints/common/DEPS
new file mode 100644
index 0000000..1c40d98
--- /dev/null
+++ b/components/network_hints/common/DEPS
@@ -0,0 +1,3 @@
+include_rules = [
+  "+ipc",
+]
diff --git a/components/network_hints/common/network_hints_common.cc b/components/network_hints/common/network_hints_common.cc
new file mode 100644
index 0000000..c6d64ae
--- /dev/null
+++ b/components/network_hints/common/network_hints_common.cc
@@ -0,0 +1,18 @@
+// Copyright 2014 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 "components/network_hints/common/network_hints_common.h"
+
+namespace network_hints {
+
+const size_t kMaxDnsHostnamesPerRequest = 30;
+const size_t kMaxDnsHostnameLength = 255;
+
+LookupRequest::LookupRequest() {
+}
+
+LookupRequest::~LookupRequest() {
+}
+
+}  // namespace network_hints
diff --git a/components/network_hints/common/network_hints_common.h b/components/network_hints/common/network_hints_common.h
new file mode 100644
index 0000000..701b003
--- /dev/null
+++ b/components/network_hints/common/network_hints_common.h
@@ -0,0 +1,41 @@
+// Copyright (c) 2006-2008 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 COMPONENTS_NETWORK_HINTS_COMMON_NETWORK_HINTS_COMMON_H_
+#define COMPONENTS_NETWORK_HINTS_COMMON_NETWORK_HINTS_COMMON_H_
+
+#include <string>
+#include <vector>
+
+#include "url/gurl.h"
+
+namespace network_hints {
+
+// IPC messages are passed from the renderer to the browser in the form of
+// Namelist instances.
+// Each element of this vector is a hostname that needs to be looked up.
+// The hostnames should never be empty strings.
+typedef std::vector<std::string> NameList;
+// TODO(jar): We still need to switch to passing scheme/host/port in UrlList,
+// instead of NameList, from renderer (where content of pages are scanned for
+// links) to browser (where we perform predictive actions).
+typedef std::vector<GURL> UrlList;
+
+struct LookupRequest {
+  LookupRequest();
+  ~LookupRequest();
+
+  NameList hostname_list;
+};
+
+// The maximum number of hostnames submitted to the browser DNS resolver per
+// IPC call.
+extern const size_t kMaxDnsHostnamesPerRequest;
+
+// The maximum length for a given DNS hostname to resolve.
+extern const size_t kMaxDnsHostnameLength;
+
+}  // namespace network_hints
+
+#endif  // COMPONENTS_NETWORK_HINTS_COMMON_NETWORK_HINTS_COMMON_H_
diff --git a/components/network_hints/common/network_hints_message_generator.cc b/components/network_hints/common/network_hints_message_generator.cc
new file mode 100644
index 0000000..f315e98
--- /dev/null
+++ b/components/network_hints/common/network_hints_message_generator.cc
@@ -0,0 +1,33 @@
+// Copyright 2014 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.
+
+// Get basic type definitions.
+#define IPC_MESSAGE_IMPL
+#include "components/network_hints/common/network_hints_message_generator.h"
+
+// Generate constructors.
+#include "ipc/struct_constructor_macros.h"
+#include "components/network_hints/common/network_hints_message_generator.h"
+
+// Generate destructors.
+#include "ipc/struct_destructor_macros.h"
+#include "components/network_hints/common/network_hints_message_generator.h"
+
+// Generate param traits write methods.
+#include "ipc/param_traits_write_macros.h"
+namespace IPC {
+#include "components/network_hints/common/network_hints_message_generator.h"
+}  // namespace IPC
+
+// Generate param traits read methods.
+#include "ipc/param_traits_read_macros.h"
+namespace IPC {
+#include "components/network_hints/common/network_hints_message_generator.h"
+}  // namespace IPC
+
+// Generate param traits log methods.
+#include "ipc/param_traits_log_macros.h"
+namespace IPC {
+#include "components/network_hints/common/network_hints_message_generator.h"
+}  // namespace IPC
diff --git a/components/network_hints/common/network_hints_message_generator.h b/components/network_hints/common/network_hints_message_generator.h
new file mode 100644
index 0000000..246cd4b
--- /dev/null
+++ b/components/network_hints/common/network_hints_message_generator.h
@@ -0,0 +1,7 @@
+// Copyright 2014 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.
+
+// Multiply-included file, no traditional include guard.
+
+#include "components/network_hints/common/network_hints_messages.h"
diff --git a/components/network_hints/common/network_hints_messages.cc b/components/network_hints/common/network_hints_messages.cc
new file mode 100644
index 0000000..e97e1a2
--- /dev/null
+++ b/components/network_hints/common/network_hints_messages.cc
@@ -0,0 +1,42 @@
+// Copyright 2014 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 "components/network_hints/common/network_hints_messages.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "components/network_hints/common/network_hints_common.h"
+
+namespace IPC {
+
+void ParamTraits<network_hints::LookupRequest>::Write(
+    Message* m, const network_hints::LookupRequest& request) {
+  IPC::WriteParam(m, request.hostname_list);
+}
+
+bool ParamTraits<network_hints::LookupRequest>::Read(
+    const Message* m,
+    PickleIterator* iter,
+    network_hints::LookupRequest* request) {
+  // Verify the hostname limits after deserialization success.
+  if (IPC::ReadParam(m, iter, &request->hostname_list)) {
+    network_hints::NameList& hostnames = request->hostname_list;
+    if (hostnames.size() > network_hints::kMaxDnsHostnamesPerRequest)
+      return false;
+
+    for (const auto& hostname : hostnames) {
+      if (hostname.length() > network_hints::kMaxDnsHostnameLength)
+        return false;
+    }
+  }
+  return true;
+}
+
+void ParamTraits<network_hints::LookupRequest>::Log(
+    const network_hints::LookupRequest& p, std::string* l) {
+  l->append("<network_hints::LookupRequest: ");
+  l->append(base::SizeTToString(p.hostname_list.size()));
+  l->append(" hostnames>");
+}
+
+}  // namespace IPC
diff --git a/components/network_hints/common/network_hints_messages.h b/components/network_hints/common/network_hints_messages.h
new file mode 100644
index 0000000..9c52c3a
--- /dev/null
+++ b/components/network_hints/common/network_hints_messages.h
@@ -0,0 +1,40 @@
+// Copyright 2014 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.
+
+// Multiply-included file, no traditional include guard.
+#include <string>
+#include <vector>
+
+#include "components/network_hints/common/network_hints_common.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+
+// Singly-included section for custom IPC traits.
+#ifndef COMPONENTS_NETWORK_HINTS_COMMON_NETWORK_HINTS_MESSAGES_H_
+#define COMPONENTS_NETWORK_HINTS_COMMON_NETWORK_HINTS_MESSAGES_H_
+
+namespace IPC {
+
+template <>
+struct ParamTraits<network_hints::LookupRequest> {
+  typedef network_hints::LookupRequest param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
+}  // namespace IPC
+
+#endif  // COMPONENTS_NETWORK_HINTS_COMMON_NETWORK_HINTS_MESSAGES_H_
+
+#define IPC_MESSAGE_START DnsPrefetchMsgStart
+
+//-----------------------------------------------------------------------------
+// Host messages
+// These are messages sent from the renderer process to the browser process.
+
+// Request for a DNS prefetch of the names in the array.
+// NameList is typedef'ed std::vector<std::string>
+IPC_MESSAGE_CONTROL1(DnsPrefetchMsg_RequestPrefetch,
+                     network_hints::LookupRequest)