Introduce features::kBundledHTTPExchanges

Bug: 966753
Change-Id: I96ef53cffae46c0d69ce4c1240e6283075ea3228
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628629Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663010}

content/public/common/content_features.cc

@@ -87,6 +87,11 @@ const base::Feature kTouchpadOverscrollHistoryNavigation {
 const base::Feature kBlockCredentialedSubresources{
     "BlockCredentialedSubresources", base::FEATURE_ENABLED_BY_DEFAULT};
 
+// Controls whether Bundled HTTP Exchanges is enabled.
+// https://wicg.github.io/webpackage/draft-yasskin-wpack-bundled-exchanges.html
+const base::Feature kBundledHTTPExchanges{"BundledHTTPExchanges",
+                                          base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables code caching for inline scripts.
 const base::Feature kCacheInlineScriptCode{"CacheInlineScriptCode",
                                            base::FEATURE_ENABLED_BY_DEFAULT};

content/public/common/content_features.h

@@ -32,6 +32,7 @@ CONTENT_EXPORT extern const base::Feature kBlinkHeapIncrementalMarking;
 CONTENT_EXPORT extern const base::Feature kBlinkHeapUnifiedGCScheduling;
 CONTENT_EXPORT extern const base::Feature kBloatedRendererDetection;
 CONTENT_EXPORT extern const base::Feature kBlockCredentialedSubresources;
+CONTENT_EXPORT extern const base::Feature kBundledHTTPExchanges;
 CONTENT_EXPORT extern const base::Feature kCacheInlineScriptCode;
 CONTENT_EXPORT extern const base::Feature kCanvas2DImageChromium;
 CONTENT_EXPORT extern const base::Feature kCompositeOpaqueFixedPosition;