chore: improve `contents.takeHeapSnapshot` error messages (#37434)

* chore: improve contents.takeHeapSnapshot error messages

* fix wstring conversion issue

shell/browser/api/electron_api_web_contents.cc

@@ -3609,18 +3609,26 @@ v8::Local<v8::Promise> WebContents::TakeHeapSnapshot(
   flags = base::File::AddFlagsForPassingToUntrustedProcess(flags);
   base::File file(file_path, flags);
   if (!file.IsValid()) {
-    promise.RejectWithErrorMessage("takeHeapSnapshot failed");
+    promise.RejectWithErrorMessage(
+        "Failed to take heap snapshot with invalid file path " +
+#if BUILDFLAG(IS_WIN)
+        base::WideToUTF8(file_path.value()));
+#else
+        file_path.value());
+#endif
     return handle;
   }
 
   auto* frame_host = web_contents()->GetPrimaryMainFrame();
   if (!frame_host) {
-    promise.RejectWithErrorMessage("takeHeapSnapshot failed");
+    promise.RejectWithErrorMessage(
+        "Failed to take heap snapshot with invalid webContents main frame");
     return handle;
   }
 
   if (!frame_host->IsRenderFrameLive()) {
-    promise.RejectWithErrorMessage("takeHeapSnapshot failed");
+    promise.RejectWithErrorMessage(
+        "Failed to take heap snapshot with nonexistent render frame");
     return handle;
   }
 
@@ -3640,7 +3648,7 @@ v8::Local<v8::Promise> WebContents::TakeHeapSnapshot(
             if (success) {
               promise.Resolve();
             } else {
-              promise.RejectWithErrorMessage("takeHeapSnapshot failed");
+              promise.RejectWithErrorMessage("Failed to take heap snapshot");
             }
           },
           base::Owned(std::move(electron_renderer)), std::move(promise)));

spec/api-web-contents-spec.ts

@@ -1803,8 +1803,24 @@ describe('webContents module', () => {
 
       await w.loadURL('about:blank');
 
-      const promise = w.webContents.takeHeapSnapshot('');
-      return expect(promise).to.be.eventually.rejectedWith(Error, 'takeHeapSnapshot failed');
+      const badPath = path.join('i', 'am', 'a', 'super', 'bad', 'path');
+      const promise = w.webContents.takeHeapSnapshot(badPath);
+      return expect(promise).to.be.eventually.rejectedWith(Error, `Failed to take heap snapshot with invalid file path ${badPath}`);
+    });
+
+    it('fails with invalid render process', async () => {
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          sandbox: true
+        }
+      });
+
+      const filePath = path.join(app.getPath('temp'), 'test.heapsnapshot');
+
+      w.webContents.destroy();
+      const promise = w.webContents.takeHeapSnapshot(filePath);
+      return expect(promise).to.be.eventually.rejectedWith(Error, 'Failed to take heap snapshot with nonexistent render frame');
     });
   });