Use -userIsInteracting for user gesture detection if voice over is off.

Notable changes:
 - updated testLinkWithBlankTargetWithoutUserGesture to execute script
   without user gesture
 - removed NavigationActionInitiationType::kScriptInitiated because there
   is no way to tell if action was initiated by the script (coordinates or
   SyntheticClickType can be 0 for valid link clicks).
 - Updated webView:createWebViewWithConfiguration: to use
   GetNavigationActionInitiationTypeWithVoiceOverOn, because there is no
   need to inspect action.description when Voice over is Off.
   -userIsInteracting can give false positives for link clicks, which is
   ok. window.open also have these false positives, so if the page wants
   to open a popup, it can exploit window.open.

Bug: 849749
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8c179c9df2d6bce3253e46272c2f14e0eb6224bc
Reviewed-on: https://chromium-review.googlesource.com/1087389
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565442}

ios/chrome/browser/web/window_open_by_dom_egtest.mm

@@ -28,6 +28,7 @@
 #error "This file requires ARC support."
 #endif
 
+using chrome_test_util::ExecuteJavaScript;
 using chrome_test_util::GetCurrentWebState;
 using chrome_test_util::OmniboxText;
 using chrome_test_util::TapWebViewElementWithId;
@@ -86,8 +87,6 @@ id<GREYMatcher> PopupBlocker() {
 // Tests that sessionStorage content is available for windows opened by DOM via
 // target="_blank" links.
 - (void)testLinkWithBlankTargetSessionStorage {
-  using chrome_test_util::ExecuteJavaScript;
-
   NSError* error = nil;
   ExecuteJavaScript(@"sessionStorage.setItem('key', 'value');", &error);
   GREYAssert(!error, @"Error during script execution: %@", error);
@@ -113,8 +112,12 @@ id<GREYMatcher> PopupBlocker() {
 
 // Tests executing script that clicks a link with target="_blank".
 - (void)testLinkWithBlankTargetWithoutUserGesture {
-  GREYAssert(TapWebViewElementWithId("webScenarioWindowOpenRegularLink"),
-             @"Failed to tap \"webScenarioWindowOpenRegularLink\"");
+  chrome_test_util::SetContentSettingsBlockPopups(CONTENT_SETTING_BLOCK);
+  NSError* error = nil;
+  ExecuteJavaScript(
+      @"document.getElementById('webScenarioWindowOpenRegularLink').click()",
+      &error);
+  GREYAssert(!error, @"Failed to tap 'webScenarioWindowOpenRegularLink'");
   [ChromeEarlGrey waitForElementWithMatcherSufficientlyVisible:PopupBlocker()];
   [ChromeEarlGrey waitForMainTabCount:1];
 }

ios/web/web_state/ui/crw_web_controller.mm

@@ -4089,21 +4089,19 @@ registerLoadRequestForURL:(const GURL&)requestURL
   GURL openerURL =
       referrer.length ? GURL(base::SysNSStringToUTF8(referrer)) : _documentURL;
 
-  bool initiatedByUser = web::GetNavigationActionInitiationType(action) ==
-                         web::NavigationActionInitiationType::kUserInitiated;
-  if (action.navigationType == WKNavigationTypeLinkActivated) {
-    // Link with target="_blank" navigation. |initiatedByUser| reliably
-    // indicates the presence of the user gesture.
-  } else {
-    DCHECK(action.navigationType == WKNavigationTypeOther ||
-           action.navigationType == WKNavigationTypeFormSubmitted)
-        << "unexpected navigation type: " << action.navigationType;
-    // Form submission with target="_blank" or window.open() navigation (with or
-    // without user gesture). There is no reliable way to tell if there was a
-    // user gesture, so this code checks if user has recently tapped on web
-    // view. TODO(crbug.com/809706): Remove the usage of -userIsInteracting when
-    // rdar://19989909 is fixed.
-    initiatedByUser = initiatedByUser || [self userIsInteracting];
+  // There is no reliable way to tell if there was a user gesture, so this code
+  // checks if user has recently tapped on web view. TODO(crbug.com/809706):
+  // Remove the usage of -userIsInteracting when rdar://19989909 is fixed.
+  bool initiatedByUser = [self userIsInteracting];
+
+  if (UIAccessibilityIsVoiceOverRunning()) {
+    // -userIsInteracting returns NO if VoiceOver is On. Inspect action's
+    // description, which may contain the information about user gesture for
+    // certain link clicks.
+    initiatedByUser = initiatedByUser ||
+                      web::GetNavigationActionInitiationTypeWithVoiceOverOn(
+                          action.description) ==
+                          web::NavigationActionInitiationType::kUserInitiated;
   }
 
   WebState* childWebState =

ios/web/web_state/ui/wk_navigation_action_util.h

@@ -17,10 +17,8 @@ enum class NavigationActionInitiationType {
   // there is no way to detect if the navigationAction initiator by examining
   // the WKNavigationAction fields.
   kUnknownInitiator = 0,
-  // The navigation action is initiated by the user.
+  // The navigation action is a link click initiated by the user.
   kUserInitiated,
-  // The navigation action is initiated by by page script.
-  kScriptInitiated,
 };
 
 // Returns the WKNavigationAction initiation type.

ios/web/web_state/ui/wk_navigation_action_util.mm

@@ -28,6 +28,7 @@ NavigationActionInitiationType GetNavigationActionInitiationType(
 // Example description where the syntheticClickType is set:
 // "<classname: 0x123124; navigationType = 2; syntheticClickType = 1;
 //  position x = 90.20 y = 10.29 request = null; ..>"
+// SyntheticClickType still can be 0 for user-initiated actions.
 NavigationActionInitiationType
 GetNavigationActionInitiationTypeWithVoiceOverOff(
     NSString* action_description) {
@@ -49,7 +50,7 @@ GetNavigationActionInitiationTypeWithVoiceOverOff(
   // TwoFingerTap}.
   int click_type = [action_description substringWithRange:match_range].intValue;
   return click_type ? NavigationActionInitiationType::kUserInitiated
-                    : NavigationActionInitiationType::kScriptInitiated;
+                    : NavigationActionInitiationType::kUnknownInitiator;
 }
 
 // Returns the NavigationAction initiation type based on the string description
@@ -60,6 +61,7 @@ GetNavigationActionInitiationTypeWithVoiceOverOff(
 // Example description where only position is set:
 // "<classname: 0x121124; navigationType = 1; syntheticClickType = 0;
 //  position x = 90.20 y = 10.29 request = null; ..>"
+// Both coordinates still can be 0 for user-initiated actions.
 NavigationActionInitiationType GetNavigationActionInitiationTypeWithVoiceOverOn(
     NSString* action_description) {
   NSRegularExpression* position_regex = [NSRegularExpression
@@ -86,7 +88,7 @@ NavigationActionInitiationType GetNavigationActionInitiationTypeWithVoiceOverOn(
           .floatValue;
   return (position_y || position_x)
              ? NavigationActionInitiationType::kUserInitiated
-             : NavigationActionInitiationType::kScriptInitiated;
+             : NavigationActionInitiationType::kUnknownInitiator;
 }
 
 }  // namespace web

ios/web/web_state/ui/wk_navigation_action_util_unittest.mm

@@ -40,13 +40,13 @@ TEST_F(WKNavigationActionUtilTest, InitiationTypeFromDescriptionWithVoiceOver) {
       NavigationActionInitiationType::kUnknownInitiator;
   initiation_type = GetNavigationActionInitiationTypeWithVoiceOverOn(
       MakeDescriptionString(0, 0, 0, 0));
-  EXPECT_EQ(NavigationActionInitiationType::kScriptInitiated, initiation_type);
+  EXPECT_EQ(NavigationActionInitiationType::kUnknownInitiator, initiation_type);
   initiation_type = GetNavigationActionInitiationTypeWithVoiceOverOn(
       MakeDescriptionString(0, 0, 100.0, 25.0));
   EXPECT_EQ(NavigationActionInitiationType::kUserInitiated, initiation_type);
   initiation_type = GetNavigationActionInitiationTypeWithVoiceOverOn(
       MakeDescriptionString(0, 1, 0, 0));
-  EXPECT_EQ(NavigationActionInitiationType::kScriptInitiated, initiation_type);
+  EXPECT_EQ(NavigationActionInitiationType::kUnknownInitiator, initiation_type);
   initiation_type = GetNavigationActionInitiationTypeWithVoiceOverOn(
       MakeDescriptionString(2, 2, 20.0, 30.4));
   EXPECT_EQ(NavigationActionInitiationType::kUserInitiated, initiation_type);
@@ -63,10 +63,10 @@ TEST_F(WKNavigationActionUtilTest, InitiationTypeFromDescriptionNoVoiceOver) {
       NavigationActionInitiationType::kUnknownInitiator;
   initiation_type = GetNavigationActionInitiationTypeWithVoiceOverOff(
       MakeDescriptionString(0, 0, 0, 0));
-  EXPECT_EQ(NavigationActionInitiationType::kScriptInitiated, initiation_type);
+  EXPECT_EQ(NavigationActionInitiationType::kUnknownInitiator, initiation_type);
   initiation_type = GetNavigationActionInitiationTypeWithVoiceOverOff(
       MakeDescriptionString(0, 0, 100.0, 25.0));
-  EXPECT_EQ(NavigationActionInitiationType::kScriptInitiated, initiation_type);
+  EXPECT_EQ(NavigationActionInitiationType::kUnknownInitiator, initiation_type);
   initiation_type = GetNavigationActionInitiationTypeWithVoiceOverOff(
       MakeDescriptionString(2, 1, 0, 0));
   EXPECT_EQ(NavigationActionInitiationType::kUserInitiated, initiation_type);