Implement device-ram client hints header

third_party/WebKit/Source/platform/loader/fetch/ClientHintsPreferences.cpp

 // Copyright 2015 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.
 
 #include "platform/loader/fetch/ClientHintsPreferences.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/network/HTTPParsers.h"
 
 namespace blink {
 
 ClientHintsPreferences::ClientHintsPreferences()
-    : should_send_dpr_(false),
+    : should_send_device_ram_(false),
+      should_send_dpr_(false),
       should_send_resource_width_(false),
       should_send_viewport_width_(false) {}
 
 void ClientHintsPreferences::UpdateFrom(
     const ClientHintsPreferences& preferences) {
+  should_send_device_ram_ = preferences.should_send_device_ram_;
   should_send_dpr_ = preferences.should_send_dpr_;
   should_send_resource_width_ = preferences.should_send_resource_width_;
   should_send_viewport_width_ = preferences.should_send_viewport_width_;
 }
 
 void ClientHintsPreferences::UpdateFromAcceptClientHintsHeader(
     const String& header_value,
     Context* context) {
   if (!RuntimeEnabledFeatures::clientHintsEnabled() || header_value.IsEmpty())
     return;
 
   CommaDelimitedHeaderSet accept_client_hints_header;
   ParseCommaDelimitedHeader(header_value, accept_client_hints_header);
+  if (RuntimeEnabledFeatures::deviceRAMHeaderEnabled() &&
+      accept_client_hints_header.Contains("device-ram")) {
+    if (context)
+      context->CountClientHintsDeviceRAM();
+    should_send_device_ram_ = true;
+  }
+
   if (accept_client_hints_header.Contains("dpr")) {
     if (context)
       context->CountClientHintsDPR();
     should_send_dpr_ = true;
   }
 
   if (accept_client_hints_header.Contains("width")) {
     if (context)
       context->CountClientHintsResourceWidth();
     should_send_resource_width_ = true;
   }
 
   if (accept_client_hints_header.Contains("viewport-width")) {
     if (context)
       context->CountClientHintsViewportWidth();
     should_send_viewport_width_ = true;
   }
 }
 
 }  // namespace blink