[iOS] Add feature flag for fullpage screenshot generation

Bug: 1103776
Change-Id: I5b52e9aa2c7250faf396393a776ce5484f68fa60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2290778
Commit-Queue: Julian Mentasti-Meza <jmentasti@google.com>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790039}

chrome/browser/flag-metadata.json

@@ -1524,6 +1524,11 @@
     "owners": [ "asanka" ],
     "expiry_milestone": 86
   },
+  {
+    "name": "enable-fullpage-screenshot",
+    "owners": [ "jmentasti", "seblalancette" ],
+    "expiry_milestone": 90
+  },
   {
     "name": "enable-future-v8-vm-features",
     "owners": [ "hablich" ],

ios/chrome/browser/flags/about_flags.mm

@@ -665,6 +665,10 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kAddWebContentDropInteractionDescription,
      flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(web::features::kAddWebContentDropInteraction)},
+    {"enable-fullpage-screenshot",
+     flag_descriptions::kEnableFullPageScreenshotName,
+     flag_descriptions::kEnableFullPageScreenshotDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(kEnableFullPageScreenshot)},
 };
 
 bool SkipConditionalFeatureEntry(const flags_ui::FeatureEntry& entry) {

ios/chrome/browser/flags/ios_chrome_flag_descriptions.cc

@@ -228,6 +228,11 @@ const char kEnableClipboardProviderImageSuggestionsName[] =
 const char kEnableClipboardProviderImageSuggestionsDescription[] =
     "Enable suggesting a search for the image copied to the clipboard";
 
+const char kEnableFullPageScreenshotName[] = "Enable fullpage screenshots";
+const char kEnableFullPageScreenshotDescription[] =
+    "Enables the option of capturing an entire webpage as a PDF when a "
+    "screenshot is taken.";
+
 const char kEnableIOSManagedSettingsUIName[] = "Enable IOS Managed Settings UI";
 const char kEnableIOSManagedSettingsUIDescription[] =
     "Enable showing a different UI when the setting is managed by an "

ios/chrome/browser/flags/ios_chrome_flag_descriptions.h

@@ -192,6 +192,10 @@ extern const char kEnableAutofillCacheServerCardInfoDescription[];
 extern const char kEnableClipboardProviderImageSuggestionsName[];
 extern const char kEnableClipboardProviderImageSuggestionsDescription[];
 
+// Title and description for the flag to enable fullpage screenshots.
+extern const char kEnableFullPageScreenshotName[];
+extern const char kEnableFullPageScreenshotDescription[];
+
 // Title and description for the flag to enable to show a different UI when the
 // setting is managed by an enterprise policy.
 extern const char kEnableIOSManagedSettingsUIName[];

ios/chrome/browser/ui/ui_feature_flags.cc

@@ -62,3 +62,6 @@ const base::Feature kIllustratedEmptyStates{"IllustratedEmptyStates",
 
 const base::Feature kSharedHighlightingIOS{"SharedHighlightingIOS",
                                            base::FEATURE_DISABLED_BY_DEFAULT};
+
+const base::Feature kEnableFullPageScreenshot{
+    "EnableFullPageScreenshot", base::FEATURE_DISABLED_BY_DEFAULT};

ios/chrome/browser/ui/ui_feature_flags.h

@@ -69,4 +69,7 @@ extern const base::Feature kIllustratedEmptyStates;
 // and Link to Text features).
 extern const base::Feature kSharedHighlightingIOS;
 
+// Feature flag that enables taking fullpage screenshots of a webpage.
+extern const base::Feature kEnableFullPageScreenshot;
+
 #endif  // IOS_CHROME_BROWSER_UI_UI_FEATURE_FLAGS_H_