Add support for the screencast API

src/browser/tab/mod.rs

@@ -1825,4 +1825,32 @@ impl Tab {
         self.bypass_webgl_vendor()?;
         Ok(())
     }
+
+    pub fn start_screencast(
+        &self,
+        format: Option<Page::StartScreencastFormatOption>,
+        quality: Option<u32>,
+        max_width: Option<u32>,
+        max_height: Option<u32>,
+        every_nth_frame: Option<u32>,
+    ) -> Result<()> {
+        self.call_method(Page::StartScreencast {
+            format,
+            quality,
+            max_width,
+            max_height,
+            every_nth_frame,
+        })?;
+        Ok(())
+    }
+
+    pub fn stop_screencast(&self) -> Result<()> {
+        self.call_method(Page::StopScreencast(None))?;
+        Ok(())
+    }
+
+    pub fn ack_screencast(&self, session_id: u32) -> Result<()> {
+        self.call_method(Page::ScreencastFrameAck { session_id })?;
+        Ok(())
+    }
 }