[DevTools] Separate ScreenCaptureModel out of ResourceTreeModel.

third_party/WebKit/Source/devtools/front_end/protocol/InspectorBackend.js

Index: third_party/WebKit/Source/devtools/front_end/protocol/InspectorBackend.js
diff --git a/third_party/WebKit/Source/devtools/front_end/protocol/InspectorBackend.js b/third_party/WebKit/Source/devtools/front_end/protocol/InspectorBackend.js
index 3c01fe964b7e0c01ff7d14d5ca99c52d340ad991..293e2ab31d1bc45594ea70d0ac7837e476be3151 100644
--- a/third_party/WebKit/Source/devtools/front_end/protocol/InspectorBackend.js
+++ b/third_party/WebKit/Source/devtools/front_end/protocol/InspectorBackend.js
@@ -378,7 +378,7 @@ Protocol.TargetBase = class {
     if (!this._dispatchers[domain])
       return;
 
-    this._dispatchers[domain].setDomainDispatcher(dispatcher);
+    this._dispatchers[domain].addDomainDispatcher(dispatcher);
   }
 
   /**
@@ -663,7 +663,7 @@ Protocol.InspectorBackend._AgentPrototype = class {
 Protocol.InspectorBackend._DispatcherPrototype = class {
   constructor() {
     this._eventArgs = {};
-    this._dispatcher = null;
+    this._dispatchers = [];
   }
 
   /**
@@ -677,8 +677,8 @@ Protocol.InspectorBackend._DispatcherPrototype = class {
   /**
    * @param {!Object} dispatcher
    */
-  setDomainDispatcher(dispatcher) {
-    this._dispatcher = dispatcher;
+  addDomainDispatcher(dispatcher) {
+    this._dispatchers.push(dispatcher);
   }
 
   /**
@@ -686,10 +686,10 @@ Protocol.InspectorBackend._DispatcherPrototype = class {
    * @param {!Object} messageObject
    */
   dispatch(functionName, messageObject) {
-    if (!this._dispatcher)
+    if (!this._dispatchers.length)
       return;
 
-    if (!(functionName in this._dispatcher)) {
+    if (!(functionName in this._dispatchers[0])) {
       Protocol.InspectorBackend.reportProtocolError(
           'Protocol Error: Attempted to dispatch an unimplemented method \'' + messageObject.method + '\'',
           messageObject);
@@ -714,7 +714,8 @@ Protocol.InspectorBackend._DispatcherPrototype = class {
     if (Protocol.InspectorBackend.Options.dumpInspectorTimeStats)
       console.time(timingLabel);
 
-    this._dispatcher[functionName].apply(this._dispatcher, params);
+    for (var index = 0; index < this._dispatchers.length; index++)

[pfeldman, 2017/02/03 03:01:08]

++index

+      this._dispatchers[index][functionName].apply(this._dispatchers[index], params);
 
     if (Protocol.InspectorBackend.Options.dumpInspectorTimeStats)
       console.timeEnd(timingLabel);