Add brotli content-encoding filter.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index f954b05769264d0bff3c261e707f13b55abd8403..cd0b1e811473ed90d280f5926012019d81a8724b 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -55,6 +55,7 @@
 #include "grit/components_strings.h"
 #include "media/base/media_switches.h"
 #include "media/midi/midi_switches.h"
+#include "net/http/http_features.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/display/display_switches.h"
@@ -2020,6 +2021,13 @@ const FeatureEntry kFeatureEntries[] = {
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppContainer,
                                switches::kDisableAppContainer)},
 #endif  // defined(OS_WIN)
+#if !defined(DISABLE_BROTLI_SUPPORT)

[Ryan Sleevi, 2015/12/17 01:04:40]

BUG: Please review
https://groups.google.com/a/chromium.org/d/msg/chromium-dev/5c4ySpPsV14/JJfAe...

#if BUILDFLAG(DISABLE_BROTLI_SUPPORT)

[eustas, 2015/12/17 16:44:54]

All 3 exmaples of buildflag look simple - I don't see a way to change the value
of the flag for concrete target (e.g. for cronet_small). Is it possible?

[Ryan Sleevi, 2015/12/17 22:49:33]

That's not possible today either. That's part of why it's a BUG - what you're
trying to do (defining at the top-most target whether or not a feature is
enabled) is explicitly not supported.

+    {"enable-brotli",
+     IDS_FLAGS_ENABLE_BROTLI_NAME,
+     IDS_FLAGS_ENABLE_BROTLI_DESCRIPTION,
+     kOsAll,
+     FEATURE_VALUE_TYPE(net::features::kBrotliEncodingFeature)},
+#endif  // !defined(DISABLE_BROTLI_SUPPORT)
 #if defined(OS_ANDROID)
     {"disable-auto-hiding-toolbar-threshold",
      IDS_FLAGS_DISABLE_AUTO_HIDING_TOOLBAR_NAME,