content_constants.h revision 7dbb3d5cf0c15f500944d211057644d6a2f37371 
1// Copyright (c) 2012 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// A handful of resource-like constants related to the Content application.
6
7#ifndef CONTENT_PUBLIC_COMMON_CONTENT_CONSTANTS_H_
8#define CONTENT_PUBLIC_COMMON_CONTENT_CONSTANTS_H_
9
10#include <stddef.h>         // For size_t
11
12#include "base/files/file_path.h"
13#include "content/common/content_export.h"
14
15namespace content {
16
17// The name of the directory under BrowserContext::GetPath where the AppCache is
18// put.
19CONTENT_EXPORT extern const base::FilePath::CharType kAppCacheDirname[];
20// The name of the directory under BrowserContext::GetPath where Pepper plugin
21// data is put.
22CONTENT_EXPORT extern const base::FilePath::CharType kPepperDataDirname[];
23
24// The MIME type used for the browser plugin.
25CONTENT_EXPORT extern const char kBrowserPluginMimeType[];
26
27CONTENT_EXPORT extern const size_t kMaxRendererProcessCount;
28
29// The maximum number of session history entries per tab.
30extern const int kMaxSessionHistoryEntries;
31
32// The maximum number of characters of the document's title that we're willing
33// to accept in the browser process.
34extern const size_t kMaxTitleChars;
35
36// The maximum number of characters in the URL that we're willing to accept
37// in the browser process. It is set low enough to avoid damage to the browser
38// but high enough that a web site can abuse location.hash for a little storage.
39// We have different values for "max accepted" and "max displayed" because
40// a data: URI may be legitimately massive, but the full URI would kill all
41// known operating systems if you dropped it into a UI control.
42CONTENT_EXPORT extern const size_t kMaxURLChars;
43CONTENT_EXPORT extern const size_t kMaxURLDisplayChars;
44
45extern const char kStatsFilename[];
46extern const int kStatsMaxThreads;
47extern const int kStatsMaxCounters;
48
49// Most sequence numbers are used by a renderer when responding to a browser
50// request for histogram data.  This reserved number is used when a renderer
51// sends an unprovoked update, such as after a page has been loaded.  Using
52// this reserved constant avoids any chance of confusion with a response having
53// a browser-supplied sequence number.
54CONTENT_EXPORT extern const int kHistogramSynchronizerReservedSequenceNumber;
55
56CONTENT_EXPORT extern const char kGpuCompositingFieldTrialName[];
57CONTENT_EXPORT extern const char
58    kGpuCompositingFieldTrialForceCompositingEnabledName[];
59CONTENT_EXPORT extern const char kGpuCompositingFieldTrialThreadEnabledName[];
60
61// Shared constants for the low latency flash audio field trial.
62CONTENT_EXPORT extern const char kLowLatencyFlashAudioFieldTrialName[];
63CONTENT_EXPORT extern const char kLowLatencyFlashAudioFieldTrialEnabledName[];
64
65}  // namespace content
66
67#endif  // CONTENT_PUBLIC_COMMON_CONTENT_CONSTANTS_H_
68