Implement instant apps infobar.

chrome/browser/android/instantapps/instant_apps_infobar_delegate.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/android/instantapps/instant_apps_infobar_delegate.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/browser/ui/android/infobars/instant_apps_infobar.h"
+#include "components/infobars/core/infobar_delegate.h"
+#include "content/public/browser/web_contents.h"
+#include "jni/InstantAppsInfoBarDelegate_jni.h"
+
+InstantAppsInfoBarDelegate::~InstantAppsInfoBarDelegate() {}
+
+// static
+void InstantAppsInfoBarDelegate::Create(InfoBarService* infobar_service,
+                                        jobject jdata) {
+  std::unique_ptr<InstantAppsInfoBarDelegate> delegate(
+      new InstantAppsInfoBarDelegate(jdata));
+  infobar_service->AddInfoBar(base::MakeUnique<InstantAppsInfoBar>(
+      std::move(delegate)));

[Peter Kasting, 2016/08/24 04:04:06]

Nit: Optional shorter version:

  infobar_service->AddInfoBar(base::MakeUnique<InstantAppsInfoBar>(
      std::unique_ptr<InstantAppsInfoBarDelegate>(
          new InstantAppsInfoBarDelegate(jdata))));

It's admittedly ugly, but it's what most Create() functions end up doing.

[Maria, 2016/08/24 17:53:49]

Done.

+}
+
+InstantAppsInfoBarDelegate::InstantAppsInfoBarDelegate(jobject jdata) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  data_.Reset(env, jdata);
+  java_delegate_.Reset(Java_InstantAppsInfoBarDelegate_create(env));

[Peter Kasting, 2016/08/24 04:04:06]

Nit: I suggest keeping the init order here and the declaration order in the
header in sync

[Maria, 2016/08/24 17:53:49]

Done.

+}
+
+infobars::InfoBarDelegate::InfoBarIdentifier
+InstantAppsInfoBarDelegate::GetIdentifier() const {
+  return INSTANT_APPS_INFOBAR_DELEGATE_ANDROID;
+}
+
+base::string16 InstantAppsInfoBarDelegate::GetMessageText() const {
+  // Message is set in InstantAppInfobar.java
+  return base::string16();

[Peter Kasting, 2016/08/24 04:04:06]

OK, returning string16() here is fine, but this reminds me that there's
something else you should do.

InfoBarManager enforces that you can't add dupe infobars.  It does it by running
EqualsDelegate() to check if two infobar delegates are the same.  You need to
override that, because the default impl in ConfirmInfoBarDelegate checks the
results of GetMessageText().  Therefore you run the risk that, if someone else
has an infobar that also returns the empty string from their GetMessageText(),
the two of you won't be able to both show infobars; the second one will just get
silently rejected.

So you should implement that function.  Probably you can just call
GetIdentifier() on both delegates, unless you need one instant apps infobar
delegate to be considered not the same as another, in which case you'll have to
put in whatever logic represents that.

[Maria, 2016/08/24 17:53:49]

Done.

+}
+
+bool InstantAppsInfoBarDelegate::Accept() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_InstantAppsInfoBarDelegate_openInstantApp(env, java_delegate_.obj());
+  return true;
+}
+
+void Launch(JNIEnv* env,
+            const base::android::JavaParamRef<jclass>& clazz,
+            const base::android::JavaParamRef<jobject>& jweb_contents,
+            const base::android::JavaParamRef<jobject>& jdata) {
+  content::WebContents* web_contents =
+        content::WebContents::FromJavaWebContents(jweb_contents);
+  InfoBarService* infobar_service =
+        InfoBarService::FromWebContents(web_contents);

[Peter Kasting, 2016/08/24 04:04:06]

Nit: I'd probably inline this statement into the next (but I'd leave the one
above, it's too ugly to try to inline that -- might change it to use auto
though)

[Maria, 2016/08/24 17:53:49]

Done.

+  InstantAppsInfoBarDelegate::Create(infobar_service, jdata);
+}
+
+bool RegisterInstantAppsInfoBarDelegate(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}