Enable features API for content shell and webview

android_webview/browser/aw_browser_main_parts.cc

Index: android_webview/browser/aw_browser_main_parts.cc
diff --git a/android_webview/browser/aw_browser_main_parts.cc b/android_webview/browser/aw_browser_main_parts.cc
index 54a3a52802a9ece09ef23c946aa12e0f8907c1a6..be57a7411195e7a454e54c91fa54676a5b8061c9 100644
--- a/android_webview/browser/aw_browser_main_parts.cc
+++ b/android_webview/browser/aw_browser_main_parts.cc
@@ -17,6 +17,7 @@
 #include "base/android/locale_utils.h"
 #include "base/android/memory_pressure_listener_android.h"
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/files/file_path.h"
 #include "base/i18n/rtl.h"
 #include "base/path_service.h"
@@ -78,12 +79,21 @@ int AwBrowserMainParts::PreCreateThreads() {
   base::android::MemoryPressureListenerAndroid::RegisterSystemCallback(
       base::android::AttachCurrentThread());
   DeferredGpuCommandService::SetInstance();
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kSingleProcess)) {
+
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
+
+  if (!command_line->HasSwitch(switches::kSingleProcess)) {
     // Create the renderers crash manager on the UI thread.
     breakpad::CrashMicroDumpManager::GetInstance();
   }
 
+  scoped_ptr<base::FeatureList> feature_list(new base::FeatureList);
+  feature_list->InitializeFromCommandLine(
+      command_line->GetSwitchValueASCII(switches::kEnableFeatures),
+      command_line->GetSwitchValueASCII(switches::kDisableFeatures));
+  base::FeatureList::SetInstance(std::move(feature_list));
+
   return content::RESULT_CODE_NORMAL_EXIT;
 }