Update examples that test Angular sites

Author: mdmintz

examples/migration/protractor/input_test.py

@@ -6,5 +6,5 @@ class AngularMaterialInputTests(BaseCase):
     def test_invalid_input(self):
         # Test that there's an error for an invalid input
         self.open("https://material.angular.io/components/input/examples")
-        self.type("#mat-input-1", "invalid")
+        self.type('input[type="email"]', "invalid")
         self.assert_element("mat-error")

examples/migration/protractor/mat_paginator_test.py

@@ -5,9 +5,11 @@
 class AngularMaterialPaginatorTests(BaseCase):
     def test_pagination(self):
         self.open("https://material.angular.io/components/paginator/examples")
+        self.click_if_visible("button.mat-mdc-button")
+        self.scroll_to("div.mat-mdc-paginator-page-size")
         # Set pagination to 5 items per page
         self.click("mat-select > div")
-        self.click("#mat-option-0")
+        self.click("mat-option:nth-of-type(1)")
         # Verify navigation to the next page
         self.click('button[aria-label="Next page"]')
         self.assert_exact_text(
@@ -20,7 +22,7 @@ def test_pagination(self):
         )
         # Set pagination to 10 items per page
         self.click("mat-select > div")
-        self.click("#mat-option-1")
+        self.click("mat-option:nth-of-type(2)")
         # Verify page with correct number of pages
         self.assert_exact_text(
             "1 – 10 of 50", ".mat-mdc-paginator-range-label"