feat(Frame): add Frame.evaluateHandle (#1885)

This patch adds Frame.evaluateHandle method. The method is a shortcut
for frame.executionContext().evaluateHandle.

Fixes #1051

lib/FrameManager.js

@@ -280,6 +280,16 @@ class Frame {
     return this._contextPromise;
   }
 
+  /**
+   * @param {function()|string} pageFunction
+   * @param {!Array<*>} args
+   * @return {!Promise<!Puppeteer.JSHandle>}
+   */
+  async evaluateHandle(pageFunction, ...args) {
+    const context = await this._contextPromise;
+    return context.evaluateHandle(pageFunction, ...args);
+  }
+
   /**
    * @param {Function|string} pageFunction
    * @param {!Array<*>} args