Add helpers to swipe up and down on the current web view.

ios/chrome/browser/ui/fullscreen_egtest.mm

Index: ios/chrome/browser/ui/fullscreen_egtest.mm
diff --git a/ios/chrome/browser/ui/fullscreen_egtest.mm b/ios/chrome/browser/ui/fullscreen_egtest.mm
index a1ecf399a2e61a28ccbd850f1c6d80cf0dc17631..cb35ad8f5cd6eb60b8da43de33fa88265340a718 100644
--- a/ios/chrome/browser/ui/fullscreen_egtest.mm
+++ b/ios/chrome/browser/ui/fullscreen_egtest.mm
@@ -17,6 +17,7 @@
 #import "ios/chrome/test/app/web_view_interaction_test_util.h"
 #include "ios/chrome/test/earl_grey/chrome_assertions.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
+#import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/chrome/test/earl_grey/chrome_util.h"
@@ -52,14 +53,6 @@ id<GREYMatcher> ContentOffset(CGPoint offset) {
       nil);
 }
 
-// Hides the toolbar by scrolling down.
-void HideToolbarUsingUI() {
-  [[EarlGrey
-      selectElementWithMatcher:WebViewScrollView(
-                                   chrome_test_util::GetCurrentWebState())]
-      performAction:grey_swipeFastInDirection(kGREYDirectionUp)];
-}
-
 // Asserts that the current URL is the |expectedURL| one.
 void AssertURLIs(const GURL& expectedURL) {
   NSString* description = [NSString
@@ -125,14 +118,11 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   [ChromeEarlGrey loadURL:URL];
 
   // Test that the toolbar is still visible after a user swipes down.
-  [[EarlGrey
-      selectElementWithMatcher:WebViewScrollView(
-                                   chrome_test_util::GetCurrentWebState())]
-      performAction:grey_swipeFastInDirection(kGREYDirectionDown)];
+  [ChromeEarlGreyUI swipeDownOnWebView];
   chrome_test_util::AssertToolbarVisible();
 
   // Test that the toolbar is no longer visible after a user swipes up.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 }
 
@@ -145,18 +135,15 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   [ChromeEarlGrey loadURL:URL];
 
   // Test that the toolbar is hidden after a user swipes up.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   // Test that the toolbar is visible after a user swipes down.
-  [[EarlGrey
-      selectElementWithMatcher:WebViewScrollView(
-                                   chrome_test_util::GetCurrentWebState())]
-      performAction:grey_swipeFastInDirection(kGREYDirectionDown)];
+  [ChromeEarlGreyUI swipeDownOnWebView];
   chrome_test_util::AssertToolbarVisible();
 
   // Test that the toolbar is hidden after a user swipes up.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 }
 
@@ -195,13 +182,10 @@ void AssertStringIsPresentOnPage(const std::string& text) {
              @"JavaScript to hide the toolbar did not complete");
 
   // Scroll up to be sure the toolbar can be dismissed by scrolling down.
-  [[EarlGrey
-      selectElementWithMatcher:WebViewScrollView(
-                                   chrome_test_util::GetCurrentWebState())]
-      performAction:grey_swipeFastInDirection(kGREYDirectionDown)];
+  [ChromeEarlGreyUI swipeDownOnWebView];
 
   // Scroll to hide the UI.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   // Test that the toolbar is visible when moving from one chrome:// link to
@@ -222,13 +206,10 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   [ChromeEarlGrey loadURL:URL];
   chrome_test_util::AssertToolbarVisible();
   // Simulate a user scroll down.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
   // Simulate a user scroll up.
-  [[EarlGrey
-      selectElementWithMatcher:WebViewScrollView(
-                                   chrome_test_util::GetCurrentWebState())]
-      performAction:grey_swipeFastInDirection(kGREYDirectionDown)];
+  [ChromeEarlGreyUI swipeDownOnWebView];
   chrome_test_util::AssertToolbarVisible();
 }
 
@@ -248,7 +229,7 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   AssertStringIsPresentOnPage("Tall page");
 
   // Hide the toolbar.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   chrome_test_util::TapWebViewElementWithId("link");
@@ -289,7 +270,7 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   chrome_test_util::AssertMainTabCount(1);
 
   // Hide the toolbar.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   // Open new window.
@@ -302,7 +283,7 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   AssertURLIs(destinationURL);
 
   // Hide the toolbar.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   // Close the tab.
@@ -340,7 +321,7 @@ void AssertStringIsPresentOnPage(const std::string& text) {
 
   AssertStringIsPresentOnPage("link1");
   // Dismiss the toolbar.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   // Navigate to the other page.
@@ -351,7 +332,7 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   chrome_test_util::AssertToolbarVisible();
 
   // Dismiss the toolbar.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   // Go back.
@@ -378,7 +359,7 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   AssertStringIsPresentOnPage("link");
 
   // Dismiss the toolbar.
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   // Go back to NTP, which is a native view.
@@ -404,7 +385,7 @@ void AssertStringIsPresentOnPage(const std::string& text) {
   web::test::SetUpHttpServer(std::move(provider));
 
   [ChromeEarlGrey loadURL:URL];
-  HideToolbarUsingUI();
+  [ChromeEarlGreyUI swipeUpOnWebView];
   chrome_test_util::AssertToolbarNotVisible();
 
   chrome_test_util::TapWebViewElementWithId("link");