Adds a /json/protocol endpoint to serve the DevTools protocol

content/browser/devtools/BUILD.gn

 # 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.
 
 import("//tools/grit/grit_rule.gni")
+import("//third_party/brotli/brotli.gni")
 import("//third_party/inspector_protocol/inspector_protocol.gni")
 
 group("resources") {
   if (!is_android) {
     public_deps = [
       ":devtools_resources",
     ]
   }
 }
 
+compressed_protocol_file =
+    "$root_gen_dir/blink/core/inspector/protocol.json.bro"
+
+compress_file_brotli("compressed_protocol_json") {
+  input_file = "$root_gen_dir/blink/core/inspector/protocol.json"
+  output_file = compressed_protocol_file
+  deps = [
+    "//third_party/WebKit/Source/core/inspector:protocol_version",
+  ]
+}
+
 grit("devtools_resources") {
   source = "$root_gen_dir/devtools/devtools_resources.grd"
   source_is_generated = true
 
   outputs = [
     "grit/devtools_resources.h",
     "devtools_resources.pak",
     "grit/devtools_resources_map.cc",
     "grit/devtools_resources_map.h",
   ]
 
+  grit_flags = [
+    "-E",
+    "compressed_protocol_file=" +
+        rebase_path(compressed_protocol_file, root_build_dir),
+  ]
+
   defines =
       [ "SHARED_INTERMEDIATE_DIR=" + rebase_path(root_gen_dir, root_build_dir) ]
 
   deps = [
+    ":compressed_protocol_json",
+
     # This is the action that generates out .grd input file.
     "//third_party/WebKit/public:blink_generate_devtools_grd",
   ]
 }
 
 inspector_protocol_generate("protocol_sources") {
   visibility = [ "//content/browser" ]
   deps = [
     "//third_party/WebKit/Source/core/inspector:protocol_version",
   ]
@@ skipping 45 matching lines @@
     "protocol/system_info.cc",
     "protocol/system_info.h",
     "protocol/target.cc",
     "protocol/target.h",
     "protocol/tethering.cc",
     "protocol/tethering.h",
     "protocol/tracing.cc",
     "protocol/tracing.h",
   ]
 }