permissions: remove PermissionQueueController and introduce PermissionInfoBarManager

chrome/browser/permissions/permission_infobar_manager.cc

+// Copyright 2015 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/permissions/permission_infobar_manager.h"
+
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/browser/permissions/permission_infobar_request.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/tab_contents/tab_util.h"
+#include "components/content_settings/core/common/content_settings.h"
+#include "components/infobars/core/infobar.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/url_constants.h"
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(PermissionInfoBarManager);
+
+PermissionInfoBarManager::PermissionInfoBarManager(
+    content::WebContents* web_contents)
+    : content::WebContentsObserver(web_contents),
+      is_show_pending_(false),
+      weak_factory_(this) {
+}
+
+PermissionInfoBarManager::~PermissionInfoBarManager() {
+}
+
+void PermissionInfoBarManager::CreateRequest(
+    const ContentSettingsType type,
+    const PermissionRequestID& request_id,
+    const GURL& requesting_frame,
+    const GURL& embedder,
+    const PermissionDecidedCallback& response_callback) {

[mlamouri (slow - plz ping), 2015/10/02 15:51:06]

nit: rename to callback

[Lalit Maganti, 2015/10/02 16:06:43]

Done.

+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  DCHECK(!current_request_.get() ||
+      current_request_->request_id() != request_id.request_id());
+
+  if (requesting_frame.SchemeIs(content::kChromeUIScheme) ||
+      embedder.SchemeIs(content::kChromeUIScheme)) {
+    return;
+  }
+
+  auto it = queued_requests_.find(request_id.request_id());
+  PermissionInfoBarRequest* request = nullptr;
+  if (it == queued_requests_.end()) {
+    request = new PermissionInfoBarRequest(request_id.request_id(),
+        requesting_frame, embedder,
+        base::Bind(&PermissionInfoBarManager::OnInfoBarClosed,
+                   base::Unretained(this)));
+    queued_requests_.add(request_id.request_id(), make_scoped_ptr(request));
+
+    // Try to trigger a show for this infobar.
+    TriggerShowNextQueuedRequest();
+  } else {
+    request = it->second;
+  }
+  request->AddPermission(type, response_callback);
+}
+
+void PermissionInfoBarManager::CancelRequest(
+    const PermissionRequestID& request_id) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  if (current_request_.get() &&
+      current_request_->request_id() == request_id.request_id()) {
+    current_request_->Cancel();
+    return;
+  }
+
+  // No-op if the request does not exist.
+  queued_requests_.erase(request_id.request_id());
+}
+
+void PermissionInfoBarManager::TriggerShowNextQueuedRequest() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  if (is_show_pending_ || ShouldIgnoreQueuedRequests())
+    return;
+
+  is_show_pending_ = true;
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&PermissionInfoBarManager::ShowNextQueuedRequest,
+                 weak_factory_.GetWeakPtr()));
+}
+
+void PermissionInfoBarManager::ShowNextQueuedRequest() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  is_show_pending_ = false;
+  if (ShouldIgnoreQueuedRequests())
+    return;
+
+  for (auto it = queued_requests_.begin(); it != queued_requests_.end();) {
+    // Increment the iterator as it will be invalidated.
+    scoped_ptr<PermissionInfoBarRequest> infobar_request =
+        queued_requests_.take_and_erase(it++);
+
+    if (infobar_request->ShowInfobar(web_contents())) {

[mlamouri (slow - plz ping), 2015/10/02 15:51:06]

Could you add a comment explaining that if ShowInfobar returns false, that means
nothing was shown and we should go to the next queued request?

[Lalit Maganti, 2015/10/02 16:06:43]

Done.

+      current_request_.reset(infobar_request.release());
+      break;
+    }
+  }
+}
+
+void PermissionInfoBarManager::OnInfoBarClosed() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  current_request_.reset();
+  TriggerShowNextQueuedRequest();
+}
+
+bool PermissionInfoBarManager::ShouldIgnoreQueuedRequests() {
+  return current_request_.get() || queued_requests_.empty();
+}