Hook up the Push API with GCM's new ability to own encryption keys.

chrome/browser/push_messaging/push_messaging_browsertest.cc

Index: chrome/browser/push_messaging/push_messaging_browsertest.cc
diff --git a/chrome/browser/push_messaging/push_messaging_browsertest.cc b/chrome/browser/push_messaging/push_messaging_browsertest.cc
index 4deed1630b9dac918f8007192978b864368b09b3..2c543879e0ea3d215150359f744eabaa8100b0d1 100644
--- a/chrome/browser/push_messaging/push_messaging_browsertest.cc
+++ b/chrome/browser/push_messaging/push_messaging_browsertest.cc
@@ -1094,6 +1094,27 @@ IN_PROC_BROWSER_TEST_F(PushMessagingBrowserTest,
   EXPECT_TRUE(stored_app_identifier2.is_null());
 }
 
+IN_PROC_BROWSER_TEST_F(PushMessagingBrowserTest, EncryptionKeyUniqueness) {
+  TryToSubscribeSuccessfully("1-0" /* expected_push_subscription_id */);
+
+  std::string first_public_key;
+  ASSERT_TRUE(RunScript("getCurve25519dh()", &first_public_key));
+  EXPECT_GE(first_public_key.size(), 32u);
+
+  std::string script_result;
+  gcm_service()->AddExpectedUnregisterResponse(gcm::GCMClient::SUCCESS);
+  ASSERT_TRUE(RunScript("unsubscribePush()", &script_result));
+  EXPECT_EQ("unsubscribe result: true", script_result);
+
+  TryToSubscribeSuccessfully("1-1" /* expected_push_subscription_id */);
+
+  std::string second_public_key;
+  ASSERT_TRUE(RunScript("getCurve25519dh()", &second_public_key));
+  EXPECT_GE(second_public_key.size(), 32u);
+
+  EXPECT_NE(first_public_key, second_public_key);
+}
+
 class PushMessagingIncognitoBrowserTest : public PushMessagingBrowserTest {
  public:
   ~PushMessagingIncognitoBrowserTest() override {}