Add --{enable,disable}-blink-features flags which set RuntimeEnabledFeatures.

content/child/runtime_features.cc

 // Copyright 2013 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 "content/child/runtime_features.h"
 
+#include <vector>
+
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
+#include "base/strings/string_split.h"
 #include "content/common/content_switches_internal.h"
 #include "content/public/common/content_switches.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "ui/native_theme/native_theme_switches.h"
 
 #if defined(OS_ANDROID)
 #include <cpu-features.h>
 #include "base/android/build_info.h"
 #include "base/metrics/field_trial.h"
 #include "media/base/android/media_codec_bridge.h"
@@ skipping 160 matching lines @@
   if (command_line.HasSwitch(switches::kReducedReferrerGranularity))
     WebRuntimeFeatures::enableReducedReferrerGranularity(true);
 
   if (command_line.HasSwitch(switches::kEnablePushMessagePayload))
     WebRuntimeFeatures::enablePushMessagingData(true);
 
   if (command_line.HasSwitch(switches::kDisableV8IdleTasks))
     WebRuntimeFeatures::enableV8IdleTasks(false);
   else
     WebRuntimeFeatures::enableV8IdleTasks(true);
+
+  // Enable explicitly enabled features, and then disable explicitly disabled
+  // ones.
+  if (command_line.HasSwitch(switches::kEnableBlinkFeatures)) {
+    std::vector<std::string> enabled_features;
+    base::SplitString(
+        command_line.GetSwitchValueASCII(switches::kEnableBlinkFeatures), ',',
+        &enabled_features);
+    for (const std::string& feature : enabled_features)

[jochen (gone - plz use gerrit), 2015/02/04 12:39:20]

please add {}

[jbroman, 2015/02/04 15:49:21]

Done.

+      WebRuntimeFeatures::enableFeatureFromString(
+          blink::WebString::fromLatin1(feature), true);
+  }
+  if (command_line.HasSwitch(switches::kDisableBlinkFeatures)) {
+    std::vector<std::string> disabled_features;
+    base::SplitString(
+        command_line.GetSwitchValueASCII(switches::kDisableBlinkFeatures), ',',
+        &disabled_features);
+    for (const std::string& feature : disabled_features)

[jochen (gone - plz use gerrit), 2015/02/04 12:39:20]

same here

[jbroman, 2015/02/04 15:49:21]

Done.

+      WebRuntimeFeatures::enableFeatureFromString(
+          blink::WebString::fromLatin1(feature), false);
+  }
 }
 
 }  // namespace content