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### Preflight Checklist
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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem Description
<!-- Is your feature request related to a problem? Please add a clear and concise description of what the problem is. -->

BrowserWindow currently offers "moved" event related to moving a window, but it only has "will-resize" and "resize" events. I want to save the current dimensions of a window when its size changes, but "will-resize" and "resize" events get fired at every single pixel change. This results in an unnecessarily large number of saving function calls or a need for debouncing the event.

### Proposed Solution
<!-- Describe the solution you'd like in a clear and concise manner -->

Adding "resized" event to BrowserWindow will solve the problem stated above.

### Alternatives Considered
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### Additional Information
<!-- Add any other context about the problem here. -->

shell/browser/api/electron_api_base_window.cc
.SetMethod("isAlwaysOnTop", &BaseWindow::IsAlwaysOnTop)
      .SetMethod("center", &BaseWindow::Center)
      .SetMethod("setPosition", &BaseWindow::SetPosition)
      .SetMethod("getPosition", &BaseWindow::GetPosition)
      .SetMethod("setTitle", &BaseWindow::SetTitle)
      .SetMethod("getTitle", &BaseWindow::GetTitle)
      .SetProperty("accessibleTitle", &BaseWindow::GetAccessibleTitle,
                   &BaseWindow::SetAccessibleTitle)
      .SetMethod("flashFrame", &BaseWindow::FlashFrame)
      .SetMethod("setSkipTaskbar", &BaseWindow::SetSkipTaskbar)
      .SetMethod("setSimpleFullScreen", &BaseWindow::SetSimpleFullScreen)
      .SetMethod("isSimpleFullScreen", &BaseWindow::IsSimpleFullScreen)
      .SetMethod("setKiosk", &BaseWindow::SetKiosk)
      .SetMethod("isKiosk", &BaseWindow::IsKiosk)
      .SetMethod("isTabletMode", &BaseWindow::IsTabletMode)
      .SetMethod("setBackgroundColor", &BaseWindow::SetBackgroundColor)
      .SetMethod("getBackgroundColor", &BaseWindow::GetBackgroundColor)
      .SetMethod("setHasShadow", &BaseWindow::SetHasShadow)
      .SetMethod("hasShadow", &BaseWindow::HasShadow)
      .SetMethod("setOpacity", &BaseWindow::SetOpacity)
      .SetMethod("getOpacity", &BaseWindow::GetOpacity)
      .SetMethod("setShape", &BaseWindow::SetShape)
      .SetMethod("setRepresentedFilename", &BaseWindow::SetRepresentedFilename)
      .SetMethod("getRepresentedFilename", &BaseWindow::GetRepresentedFilename)
      .SetMethod("setDocumentEdited", &BaseWindow::SetDocumentEdited)
      .SetMethod("isDocumentEdited", &BaseWindow::IsDocumentEdited)
      .SetMethod("setIgnoreMouseEvents", &BaseWindow::SetIgnoreMouseEvents)
      .SetMethod("setContentProtection", &BaseWindow::SetContentProtection)
      .SetMethod("setFocusable", &BaseWindow::SetFocusable)
      .SetMethod("setMenu", &BaseWindow::SetMenu)