Add basic coalescing behavior to the permission bubble manager.

chrome/browser/ui/website_settings/permission_bubble_manager.cc

 // Copyright 2014 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/ui/website_settings/permission_bubble_manager.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/ui/website_settings/permission_bubble_request.h"
 #include "chrome/common/chrome_switches.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(PermissionBubbleManager);
 
+namespace {
+// This is how many ms to wait to see if there's another permission request

[Greg Billock, 2014/02/07 20:14:24]

add a blank line around namespace lines

[leng, 2014/02/08 00:11:18]

Done.

+// we should coalesce.
+const int kPermissionsCoalesceIntervalMs = 400;
+}
+
 // static
 bool PermissionBubbleManager::Enabled() {
   return CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnablePermissionsBubbles);
 }
 
 void PermissionBubbleManager::AddRequest(PermissionBubbleRequest* request) {
   // Don't re-add an existing request.
   std::vector<PermissionBubbleRequest*>::iterator di;
   for (di = requests_.begin(); di != requests_.end(); di++) {
     if (*di == request)
       return;
   }
 
+  if (bubble_showing_) {
+    for (di = queued_requests_.begin(); di != queued_requests_.end(); di++) {
+      if (*di == request)
+        return;
+    }
+    queued_requests_.push_back(request);
+    return;
+  }
+
   requests_.push_back(request);
   // TODO(gbillock): do we need to make default state a request property?
   accept_state_.push_back(false);
 
-  // TODO(gbillock): need significantly more complex logic here to deal
-  // with various states of the manager.
-
-  if (view_ && !bubble_showing_) {
-    view_->Show(requests_, accept_state_, customization_mode_);
-    bubble_showing_ = true;
+  // Start the timer when there is both a view and a request.
+  if (view_ && !timer_->IsRunning()) {
+    timer_->Reset();
   }
 }
 
 void PermissionBubbleManager::SetView(PermissionBubbleView* view) {
   if (view == view_)
     return;
 
   if (view_ != NULL) {
     view_->SetDelegate(NULL);
     view_->Hide();
   }
 
   view_ = view;
   if (view_ == NULL)
     return;
 
   if (bubble_showing_) {
     view_->SetDelegate(this);
     view_->Show(requests_, accept_state_, customization_mode_);
   } else if (!requests_.empty()) {
-    bubble_showing_ = true;
-    view_->SetDelegate(this);
-    view_->Show(requests_, accept_state_, customization_mode_);
+    if (!timer_->IsRunning()) {
+      timer_->Reset();
+    }
   } else {
     view_->Hide();
     return;
   }
 }
 
 PermissionBubbleManager::PermissionBubbleManager(
     content::WebContents* web_contents)
   : content::WebContentsObserver(web_contents),
     bubble_showing_(false),
     view_(NULL),
     customization_mode_(false) {
+  timer_.reset(new base::Timer(FROM_HERE,
+      base::TimeDelta::FromMilliseconds(kPermissionsCoalesceIntervalMs),
+      base::Bind(&PermissionBubbleManager::OnTimerExpired,
+                 base::Unretained(this)),
+      false));
 }
 
 PermissionBubbleManager::~PermissionBubbleManager() {}
 
 void PermissionBubbleManager::WebContentsDestroyed(
     content::WebContents* web_contents) {
   // Synthetic cancel event if the user closes the WebContents.
   Closing();
 
   // The WebContents is going away; be aggressively paranoid and delete
@@ skipping 33 matching lines @@
   FinalizeBubble();
 }
 
 void PermissionBubbleManager::Closing() {
   std::vector<PermissionBubbleRequest*>::iterator di;
   for (di = requests_.begin(); di != requests_.end(); di++)
     (*di)->Cancelled();
   FinalizeBubble();
 }
 
+void PermissionBubbleManager::OnTimerExpired() {
+  if (view_ && !bubble_showing_ && requests_.size()) {
+    view_->SetDelegate(this);
+    view_->Show(requests_, accept_state_, customization_mode_);
+    bubble_showing_ = true;
+  }
+}
+
 void PermissionBubbleManager::FinalizeBubble() {
   std::vector<PermissionBubbleRequest*>::iterator di;
   for (di = requests_.begin(); di != requests_.end(); di++)
     (*di)->RequestFinished();
   requests_.clear();
   accept_state_.clear();
+  bubble_showing_ = false;
+  if (queued_requests_.size()) {
+    requests_ = queued_requests_;

[Greg Billock, 2014/02/07 20:14:24]

Need to reset the accept_state_ here, too. (Set them all to true -- I defaulted
to false above which is wrong. I have a change in the CQ to fix that.)

[leng, 2014/02/08 00:11:18]

Done.
I also changed the variable name to be plural, matching |requests_|.

+    queued_requests_.clear();
+    // TODO(leng):  Explore other options of showing the next bubble.  The
+    // advantage of this is that it uses the same code path as the first bubble.
+    timer_->Reset();
+  }
 }
 
+void PermissionBubbleManager::SetCoalesceIntervalForTesting(int interval_ms) {
+  timer_.reset(new base::Timer(FROM_HERE,
+      base::TimeDelta::FromMilliseconds(interval_ms),
+      base::Bind(&PermissionBubbleManager::OnTimerExpired,
+                 base::Unretained(this)),
+      false));
+}