[iOS] Add flag for Search for Copied Image feature

Bug: 913958
Change-Id: Ib942171d8f94e7b37cb91cdebe52c5e02141917e
Reviewed-on: https://chromium-review.googlesource.com/c/1371893
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615595}

ios/chrome/browser/about_flags.mm

@@ -494,6 +494,9 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
     {"find-in-page-iframe", flag_descriptions::kFindInPageiFrameName,
      flag_descriptions::kFindInPageiFrameDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(kFindInPageiFrame)},
+    {"search-copied-image", flag_descriptions::kSearchCopiedImageName,
+     flag_descriptions::kSearchCopiedImageDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(kSearchCopiedImage)},
 };
 
 // Add all switches from experimental flags to |command_line|.

ios/chrome/browser/ios_chrome_flag_descriptions.cc

@@ -309,6 +309,11 @@ const char kIgnoresViewportScaleLimitsName[] = "Ignore Viewport Scale Limits";
 const char kIgnoresViewportScaleLimitsDescription[] =
     "When enabled the page can always be scaled, regardless of author intent.";
 
+const char kSearchCopiedImageName[] = "Search copied image";
+const char kSearchCopiedImageDescription[] =
+    "Enable searching from the toolbar search button for an image copied to "
+    "the system pasteboard.";
+
 const char kSearchIconToggleName[] = "Change the icon for the search button";
 const char kSearchIconToggleDescription[] =
     "Different icons for the search button.";

ios/chrome/browser/ios_chrome_flag_descriptions.h

@@ -249,6 +249,10 @@ extern const char kPhysicalWebDescription[];
 extern const char kIgnoresViewportScaleLimitsName[];
 extern const char kIgnoresViewportScaleLimitsDescription[];
 
+// Title and description for the flag to enable searching for a copied image.
+extern const char kSearchCopiedImageName[];
+extern const char kSearchCopiedImageDescription[];
+
 // Title and description for the flag to toggle the flag of the search button.
 extern const char kSearchIconToggleName[];
 extern const char kSearchIconToggleDescription[];

ios/chrome/browser/ui/ui_feature_flags.cc

@@ -17,3 +17,6 @@ const base::Feature kOmniboxPopupShortcutIconsInZeroState{
     "OmniboxPopupShortcutIconsInZeroState", base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kWKWebViewSnapshots{"WKWebViewSnapshots",
                                         base::FEATURE_ENABLED_BY_DEFAULT};
+
+const base::Feature kSearchCopiedImage{"SearchCopiedImage",
+                                       base::FEATURE_DISABLED_BY_DEFAULT};

ios/chrome/browser/ui/ui_feature_flags.h

@@ -24,4 +24,7 @@ extern const base::Feature kOmniboxPopupShortcutIconsInZeroState;
 // Used to enable using the WKWebView snapshotting API for iOS 11+.
 extern const base::Feature kWKWebViewSnapshots;
 
+// Feature to allow user to search for a copied image.
+extern const base::Feature kSearchCopiedImage;
+
 #endif  // IOS_CHROME_BROWSER_UI_UI_FEATURE_FLAGS_H_