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1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_BROWSER_NET_CLIENT_HINTS_H_ | |
6 #define CHROME_BROWSER_NET_CLIENT_HINTS_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "base/memory/weak_ptr.h" | |
11 | |
12 // ClientHints is a repository in Chrome for information used | |
13 // to create the Client-Hints request header. For more information, see: | |
14 // https://github.com/igrigorik/http-client-hints/blob/master/draft-grigorik-htt p-client-hints-01.txt | |
15 class ClientHints { | |
16 public: | |
17 ClientHints(); | |
18 ~ClientHints(); | |
19 | |
20 void Init(); | |
21 | |
22 // Retrieves screen information for use on the IO thread. | |
23 bool RetrieveScreenInfo(); | |
24 | |
25 // Returns client hints pertaining to screen information. The format is: | |
26 // "dpr=x", where x is pixel ratio. Its value is the same as the value | |
27 // returned by the JavaScript command window.devicePixelRatio | |
mmenke
2013/09/25 16:26:19
nit: .
bengr
2013/09/25 17:25:52
Done.
| |
28 const std::string& GetString() const; | |
mmenke
2013/09/25 16:26:19
If the new ClientHints spec uses multiple fields,
bengr
2013/09/25 17:25:52
Changed to GetDevicePixelRatioHeader.
| |
29 | |
30 private: | |
31 friend class ClientHintsTest; | |
32 | |
33 void UpdateScreenInfo(const float* device_pixel_ratio_value); | |
34 | |
35 std::string screen_hints_; | |
36 | |
37 base::WeakPtrFactory<ClientHints> weak_ptr_factory_; | |
38 | |
39 DISALLOW_COPY_AND_ASSIGN(ClientHints); | |
40 }; | |
41 | |
42 #endif // CHROME_BROWSER_NET_CLIENT_HINTS_H_ | |
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