Changes to content/ to facilitate new zoom extension API

content/browser/host_zoom_map_impl.cc

Index: content/browser/host_zoom_map_impl.cc
diff --git a/content/browser/host_zoom_map_impl.cc b/content/browser/host_zoom_map_impl.cc
index 97a2ac7816d10a66751af9bc6f937313047db003..931be344deeccf002efa86320b3f69e0cdea3e5b 100644
--- a/content/browser/host_zoom_map_impl.cc
+++ b/content/browser/host_zoom_map_impl.cc
@@ -5,6 +5,7 @@
 #include "content/browser/host_zoom_map_impl.h"
 
 #include <cmath>
+#include <set>
 
 #include "base/strings/string_piece.h"
 #include "base/strings/utf_string_conversions.h"
@@ -17,6 +18,7 @@
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/resource_context.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/common/page_zoom.h"
 #include "net/base/net_util.h"
 
@@ -122,6 +124,12 @@ HostZoomMap::ZoomLevelVector HostZoomMapImpl::GetAllZoomLevels() const {
 
 void HostZoomMapImpl::SetZoomLevelForHost(const std::string& host,
                                           double level) {
+  SetZoomLevelForHost(host, 0, level);
+}
+
+void HostZoomMapImpl::SetZoomLevelForHost(const std::string& host,
+                                          int zoom_id,
+                                          double level) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   {
@@ -133,21 +141,14 @@ void HostZoomMapImpl::SetZoomLevelForHost(const std::string& host,
       host_zoom_levels_[host] = level;
   }
 
-  // Notify renderers from this browser context.
-  for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
-       !i.IsAtEnd(); i.Advance()) {
-    RenderProcessHost* render_process_host = i.GetCurrentValue();
-    if (HostZoomMap::GetForBrowserContext(
-            render_process_host->GetBrowserContext()) == this) {
-      render_process_host->Send(
-          new ViewMsg_SetZoomLevelForCurrentURL(std::string(), host, level));
-    }
-  }
+  SendZoomLevelChange(std::string(), host, level);
+
   HostZoomMap::ZoomLevelChange change;
   change.mode = HostZoomMap::ZOOM_CHANGED_FOR_HOST;
   change.host = host;
   change.zoom_level = level;
 
+  CallZoomCallback(zoom_id);
   zoom_level_changed_callbacks_.Notify(change);
 }
 
@@ -160,16 +161,7 @@ void HostZoomMapImpl::SetZoomLevelForHostAndScheme(const std::string& scheme,
     scheme_host_zoom_levels_[scheme][host] = level;
   }
 
-  // Notify renderers from this browser context.
-  for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
-       !i.IsAtEnd(); i.Advance()) {
-    RenderProcessHost* render_process_host = i.GetCurrentValue();
-    if (HostZoomMap::GetForBrowserContext(
-            render_process_host->GetBrowserContext()) == this) {
-      render_process_host->Send(
-          new ViewMsg_SetZoomLevelForCurrentURL(scheme, host, level));
-    }
-  }
+  SendZoomLevelChange(scheme, host, level);
 
   HostZoomMap::ZoomLevelChange change;
   change.mode = HostZoomMap::ZOOM_CHANGED_FOR_SCHEME_AND_HOST;
@@ -194,6 +186,12 @@ HostZoomMapImpl::AddZoomLevelChangedCallback(
   return zoom_level_changed_callbacks_.Add(callback);
 }
 
+void HostZoomMapImpl::AddZoomCallback(
+    int zoom_id,
+    const base::Callback<void(void)>& callback) {
+  zoom_callback_map_[zoom_id] = callback;
+}
+
 double HostZoomMapImpl::GetTemporaryZoomLevel(int render_process_id,
                                               int render_view_id) const {
   base::AutoLock auto_lock(lock_);
@@ -208,6 +206,8 @@ double HostZoomMapImpl::GetTemporaryZoomLevel(int render_process_id,
 
 void HostZoomMapImpl::SetTemporaryZoomLevel(int render_process_id,
                                             int render_view_id,
+                                            const std::string& host,
+                                            int zoom_id,
                                             double level) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
@@ -217,11 +217,7 @@ void HostZoomMapImpl::SetTemporaryZoomLevel(int render_process_id,
     for (i = 0; i < temporary_zoom_levels_.size(); ++i) {
       if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
           temporary_zoom_levels_[i].render_view_id == render_view_id) {
-        if (level) {
-          temporary_zoom_levels_[i].zoom_level = level;
-        } else {
-          temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
-        }
+        temporary_zoom_levels_[i].zoom_level = level;
         break;
       }
     }
@@ -237,8 +233,10 @@ void HostZoomMapImpl::SetTemporaryZoomLevel(int render_process_id,
 
   HostZoomMap::ZoomLevelChange change;
   change.mode = HostZoomMap::ZOOM_CHANGED_TEMPORARY_ZOOM;
+  change.host = host;
   change.zoom_level = level;
 
+  CallZoomCallback(zoom_id);
   zoom_level_changed_callbacks_.Notify(change);
 }
 
@@ -251,14 +249,7 @@ void HostZoomMapImpl::Observe(int type,
       int render_view_id = Source<RenderViewHost>(source)->GetRoutingID();
       int render_process_id =
           Source<RenderViewHost>(source)->GetProcess()->GetID();
-
-      for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
-        if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
-            temporary_zoom_levels_[i].render_view_id == render_view_id) {
-          temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
-          break;
-        }
-      }
+      EraseTemporaryZoomLevel(render_process_id, render_view_id);
       break;
     }
     default:
@@ -266,6 +257,48 @@ void HostZoomMapImpl::Observe(int type,
   }
 }
 
+void HostZoomMapImpl::EraseTemporaryZoomLevel(int render_process_id,
+                                              int render_view_id) {
+  base::AutoLock auto_lock(lock_);
+  for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
+    if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
+        temporary_zoom_levels_[i].render_view_id == render_view_id) {
+      temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
+      break;
+    }
+  }
+}
+
+void HostZoomMapImpl::CallZoomCallback(int zoom_id) {
+  std::map<int, base::Callback<void(void)> >::iterator it =
+      zoom_callback_map_.find(zoom_id);
+  if (it == zoom_callback_map_.end())
+    return;
+
+  it->second.Run();
+  zoom_callback_map_.erase(it);
+}
+
+void HostZoomMapImpl::SendZoomLevelChange(const std::string& scheme,
+                                          const std::string& host,
+                                          double level) {
+  for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
+       !i.IsAtEnd(); i.Advance()) {
+    RenderProcessHost* render_process_host = i.GetCurrentValue();
+    if (HostZoomMap::GetForBrowserContext(
+            render_process_host->GetBrowserContext()) == this) {
+      int render_process_id = render_process_host->GetID();
+      std::set<int> exceptions;
+      for (size_t i = 0; i != temporary_zoom_levels_.size(); ++i) {
+        if (temporary_zoom_levels_[i].render_process_id == render_process_id)
+          exceptions.insert(temporary_zoom_levels_[i].render_view_id);
+      }
+      render_process_host->Send(new ViewMsg_SetZoomLevelForCurrentURL(
+          scheme, host, level, exceptions));
+    }
+  }
+}
+
 HostZoomMapImpl::~HostZoomMapImpl() {
 }