Enable PaymentRequest on Android by default.

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 9c508f7ed36c0e24cf2d06a1f75996176c8462f2..9ae80313e1cdb708859837fc244f0cffcf16833b 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -248,6 +248,11 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   WebRuntimeFeatures::enableRenderingPipelineThrottling(
     base::FeatureList::IsEnabled(features::kRenderingPipelineThrottling));
 
+#if defined(OS_ANDROID)
+  WebRuntimeFeatures::enablePaymentRequest(
+      base::FeatureList::IsEnabled(features::kWebPayments));
+#endif
+
   // Enable explicitly enabled features, and then disable explicitly disabled
   // ones.
   if (command_line.HasSwitch(switches::kEnableBlinkFeatures)) {