[Web Payments] Initial plumb of Payment Request dialog

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index edadc181b79f064b4e61b5ddca3e0c6a640b945a..4cf3e376bc25d2f0a236dcc092929cec1f52774c 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -57,6 +57,7 @@
 #include "chrome/browser/notifications/platform_notification_service_impl.h"
 #include "chrome/browser/page_load_metrics/metrics_navigation_throttle.h"
 #include "chrome/browser/password_manager/chrome_password_manager_client.h"
+#include "chrome/browser/payments/payment_request_impl.h"
 #include "chrome/browser/permissions/permission_context_base.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/prerender/prerender_final_status.h"
@@ -1401,6 +1402,15 @@ bool IsAutoReloadVisibleOnlyEnabled() {
   return true;
 }
 
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_WIN)
+bool AreExperimentalWebPlatformFeaturesEnabled() {
+  const base::CommandLine& browser_command_line =
+      *base::CommandLine::ForCurrentProcess();
+  return browser_command_line.HasSwitch(
+      switches::kEnableExperimentalWebPlatformFeatures);
+}
+#endif
+
 void MaybeAppendBlinkSettingsSwitchForFieldTrial(
     const base::CommandLine& browser_command_line,
     base::CommandLine* command_line) {
@@ -2969,7 +2979,16 @@ void ChromeContentBrowserClient::RegisterRenderFrameMojoInterfaces(
                    web_contents->GetJavaInterfaces()->GetWeakPtr()));
   }
 #endif
-
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_WIN)
+  if (AreExperimentalWebPlatformFeaturesEnabled()) {
+    content::WebContents* web_contents =
+        content::WebContents::FromRenderFrameHost(render_frame_host);
+    if (web_contents) {
+      registry->AddInterface(base::Bind(CreatePaymentRequestHandler,
+          render_frame_host, web_contents));
+    }
+  }
+#endif
 #if defined(ENABLE_MEDIA_ROUTER)
   registry->AddInterface(
       base::Bind(&CastRemotingConnector::CreateRemoterFactory,