webview: add inspectElement method

atom/browser/api/atom_api_web_contents.cc

@@ -470,6 +470,13 @@ bool WebContents::IsDevToolsOpened() {
   return storage_->IsDevToolsViewShowing();
 }
 
+void WebContents::InspectElement(int x, int y) {
+  OpenDevTools();
+  scoped_refptr<content::DevToolsAgentHost> agent(
+    content::DevToolsAgentHost::GetOrCreateFor(storage_->GetWebContents()));
+  agent->InspectElement(x, y);
+}
+
 void WebContents::Undo() {
   web_contents()->Undo();
 }
@@ -591,6 +598,7 @@ mate::ObjectTemplateBuilder WebContents::GetObjectTemplateBuilder(
         .SetMethod("openDevTools", &WebContents::OpenDevTools)
         .SetMethod("closeDevTools", &WebContents::CloseDevTools)
         .SetMethod("isDevToolsOpened", &WebContents::IsDevToolsOpened)
+        .SetMethod("inspectElement", &WebContents::InspectElement)
         .SetMethod("undo", &WebContents::Undo)
         .SetMethod("redo", &WebContents::Redo)
         .SetMethod("cut", &WebContents::Cut)

atom/browser/api/atom_api_web_contents.h

@@ -67,6 +67,7 @@ class WebContents : public mate::EventEmitter,
   void OpenDevTools();
   void CloseDevTools();
   bool IsDevToolsOpened();
+  void InspectElement(int x, int y);
 
   // Editing commands.
   void Undo();

atom/renderer/lib/web-view/web-view.coffee

@@ -255,6 +255,7 @@ registerWebViewElement = ->
     "openDevTools"
     "closeDevTools"
     "isDevToolsOpened"
+    "inspectElement"
     "undo"
     "redo"
     "cut"

docs/api/web-view-tag.md

@@ -219,6 +219,13 @@ Closes the devtools window of guest page.
 
 Returns whether guest page has a devtools window attached.
 
+### `<webview>`.inspectElement(x, y)
+
+* `x` Integer
+* `y` Integer
+
+Starts inspecting element at position (`x`, `y`) of guest page.
+
 ### `<webview>`.undo()
 
 Executes editing command `undo` in page.