[WIP] DevTools: user SourceMapManager in Debugger

third_party/WebKit/Source/devtools/front_end/sdk/SourceMapManager.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/SourceMapManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/SourceMapManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/SourceMapManager.js
index 4b652c7e07ce2b40242ca14db9703cbb17b4aa56..9f9e94142da6e1b95dad1c52448f83e1d99c4eeb 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/SourceMapManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/SourceMapManager.js
@@ -132,6 +132,9 @@ SDK.SourceMapManager = class extends SDK.SDKObject {
     if (!this._isEnabled)
       return;
 
+    this.dispatchEventToListeners(
+        SDK.SourceMapManager.Events.SourceMapWillAttach, {client: client, sourceMapURL: sourceMapURL});
+
     if (this._sourceMapByURL.has(sourceMapURL)) {
       attach.call(this, sourceMapURL, client);
       return;
@@ -170,8 +173,15 @@ SDK.SourceMapManager = class extends SDK.SDKObject {
       this._sourceMapLoadedForTest();
       var clients = this._sourceMapURLToLoadingClients.get(sourceMapURL);
       this._sourceMapURLToLoadingClients.removeAll(sourceMapURL);
-      if (!sourceMap || !clients.size)
+      if (!clients.size)
+        return;
+      if (!sourceMap) {
+        for (var client of clients) {
+          this.dispatchEventToListeners(
+              SDK.SourceMapManager.Events.SourceMapFailedToAttach, {client: client, sourceMapURL: sourceMapURL});
+        }
         return;
+      }
       this._sourceMapByURL.set(sourceMapURL, sourceMap);
       for (var client of clients)
         attach.call(this, sourceMapURL, client);
@@ -218,7 +228,10 @@ SDK.SourceMapManager = class extends SDK.SDKObject {
     if (!sourceMapURL)
       return;
     if (!this._sourceMapURLToClients.hasValue(sourceMapURL, client)) {
-      this._sourceMapURLToLoadingClients.remove(sourceMapURL, client);
+      if (this._sourceMapURLToLoadingClients.remove(sourceMapURL, client)) {
+        this.dispatchEventToListeners(
+            SDK.SourceMapManager.Events.SourceMapFailedToAttach, {client: client, sourceMapURL: sourceMapURL});
+      }
       return;
     }
     this._sourceMapURLToClients.remove(sourceMapURL, client);
@@ -239,6 +252,8 @@ SDK.SourceMapManager = class extends SDK.SDKObject {
 };
 
 SDK.SourceMapManager.Events = {
+  SourceMapWillAttach: Symbol('SourceMapWillAttach'),
+  SourceMapFailedToAttach: Symbol('SourceMapFailedToAttach'),
   SourceMapAttached: Symbol('SourceMapAttached'),
   SourceMapDetached: Symbol('SourceMapDetached'),
   SourceMapChanged: Symbol('SourceMapChanged')