bluetooth: Suggest Origin Trial in console.

third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp

Index: third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
diff --git a/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp b/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
index d7cbeecba4ab21e41d182cc596b400430dc70a03..912ea0ed9ed1ac63056c67ab12733b43a411a2b9 100644
--- a/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
+++ b/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
@@ -9,6 +9,9 @@
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/inspector/ConsoleMessage.h"
+#include "core/origin_trials/OriginTrialContext.h"
+#include "core/origin_trials/OriginTrials.h"
 #include "modules/bluetooth/BluetoothDevice.h"
 #include "modules/bluetooth/BluetoothError.h"
 #include "modules/bluetooth/BluetoothSupplement.h"
@@ -130,7 +133,6 @@ static void convertRequestDeviceOptions(const RequestDeviceOptions& options, Web
 // https://webbluetoothchrome.github.io/web-bluetooth/#dom-bluetooth-requestdevice
 ScriptPromise Bluetooth::requestDevice(ScriptState* scriptState, const RequestDeviceOptions& options, ExceptionState& exceptionState)
 {
-
     // By adding the "OriginTrialEnabled" extended binding, we enable the
     // requestDevice function on all platforms for websites that contain an
     // origin trial token. Since we only support Chrome OS, Android and MacOS
@@ -142,9 +144,24 @@ ScriptPromise Bluetooth::requestDevice(ScriptState* scriptState, const RequestDe
     }
 #endif
 
+    // Promote use of Origin Trials
+    // * When not being run on an origin trial.
+    // * Only once for the lifetime of this Bluetooth object, to avoid being
+    //   a nuisance and too verbose in the console. Reloading a page will reset
+    //   and the message can be shown again.
+    ExecutionContext* context = scriptState->getExecutionContext();
+    OriginTrialContext* originTrials = OriginTrialContext::from(context, OriginTrialContext::DontCreateIfNotExists);
+    bool originTrialActiveForThisPage = originTrials && originTrials->isFeatureEnabled("WebBluetooth");
+
+    if (!originTrialActiveForThisPage && !promotedOriginTrial) {
+        promotedOriginTrial = true;
+        context->addConsoleMessage(ConsoleMessage::create(JSMessageSource, InfoMessageLevel,
+            "Web Bluetooth is available as an Origin Trial: https://bit.ly/WebBluetoothOriginTrial"));
+    }
+
     // 1. If the incumbent settings object is not a secure context, reject promise with a SecurityError and abort these steps.
     String errorMessage;
-    if (!scriptState->getExecutionContext()->isSecureContext(errorMessage)) {
+    if (!context->isSecureContext(errorMessage)) {
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(SecurityError, errorMessage));
     }