Omnibox: Disable Paste & Go for clipboard contents over 32KB

Opening omnibox context menu when clipboard contains over 32K characters caused chrome to freeze up for ~1 minute.
Other performance issues remain outside of the 'is paste & go allowed' checking and large clipboard sizes (.5 - 1 million characters) still cause freezing for ~10 seconds.

Bug: 277732
Change-Id: I7d130ef4e1668f6e73b2c670143ed69f7309cc6d
Reviewed-on: https://chromium-review.googlesource.com/1089193
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565622}

components/omnibox/browser/omnibox_edit_model.cc

@@ -444,6 +444,9 @@ bool OmniboxEditModel::CanPasteAndGo(const base::string16& text) const {
   if (!client_->IsPasteAndGoEnabled())
     return false;
 
+  if (text.length() > kMaxPasteAndGoTextLength)
+    return false;
+
   AutocompleteMatch match;
   ClassifyString(text, &match, nullptr);
   return match.destination_url.is_valid();
@@ -622,17 +625,12 @@ void OmniboxEditModel::OpenMatch(AutocompleteMatch match,
   fake_single_entry_result.AppendMatches(input_, fake_single_entry_matches);
   OmniboxLog log(
       input_.from_omnibox_focus() ? base::string16() : input_text,
-      just_deleted_text_,
-      input_.type(),
-      popup_open,
-      dropdown_ignored ? 0 : index,
-      disposition,
-      !pasted_text.empty(),
-      SessionID::InvalidValue(), // don't know tab ID; set later if appropriate
-      ClassifyPage(),
-      elapsed_time_since_user_first_modified_omnibox,
-      match.allowed_to_be_default_match ? match.inline_autocompletion.length() :
-          base::string16::npos,
+      just_deleted_text_, input_.type(), popup_open,
+      dropdown_ignored ? 0 : index, disposition, !pasted_text.empty(),
+      SessionID::InvalidValue(),  // don't know tab ID; set later if appropriate
+      ClassifyPage(), elapsed_time_since_user_first_modified_omnibox,
+      match.allowed_to_be_default_match ? match.inline_autocompletion.length()
+                                        : base::string16::npos,
       elapsed_time_since_last_change_to_default_match,
       dropdown_ignored ? fake_single_entry_result : result());
   DCHECK(dropdown_ignored ||

components/omnibox/browser/omnibox_edit_model.h

@@ -81,6 +81,11 @@ class OmniboxEditModel {
     const AutocompleteInput autocomplete_input;
   };
 
+  // This is a mirror of content::kMaxURLDisplayChars because ios cannot depend
+  // on content. If clipboard contains more than kMaxPasteAndGoTextLength
+  // characters, then the paste & go option will be disabled.
+  static const size_t kMaxPasteAndGoTextLength = 32 * 1024;
+
   OmniboxEditModel(OmniboxView* view,
                    OmniboxEditController* controller,
                    std::unique_ptr<OmniboxClient> client);

components/omnibox/browser/omnibox_edit_model_unittest.cc

@@ -7,6 +7,7 @@
 #include <stddef.h>
 
 #include <memory>
+#include <string>
 
 #include "base/test/scoped_feature_list.h"
 #include "base/test/scoped_task_environment.h"
@@ -260,3 +261,16 @@ TEST_F(OmniboxEditModelTest, GenerateMatchesFromFullFormattedUrl) {
   AutocompleteMatch match = model()->OmniboxEditModel::CurrentMatch(nullptr);
   EXPECT_EQ(AutocompleteMatchType::URL_WHAT_YOU_TYPED, match.type);
 }
+
+TEST_F(OmniboxEditModelTest, DisablePasteAndGoForLongTexts) {
+  EXPECT_TRUE(model()->OmniboxEditModel::CanPasteAndGo(
+      base::ASCIIToUTF16("short text")));
+
+  base::string16 almost_long_text = base::ASCIIToUTF16(
+      std::string(OmniboxEditModel::kMaxPasteAndGoTextLength, '.'));
+  EXPECT_TRUE(model()->OmniboxEditModel::CanPasteAndGo(almost_long_text));
+
+  base::string16 long_text = base::ASCIIToUTF16(
+      std::string(OmniboxEditModel::kMaxPasteAndGoTextLength + 1, '.'));
+  EXPECT_FALSE(model()->OmniboxEditModel::CanPasteAndGo(long_text));
+}

components/omnibox/browser/test_omnibox_client.cc

@@ -61,6 +61,10 @@ TestOmniboxClient::CreateOmniboxNavigationObserver(
   return nullptr;
 }
 
+bool TestOmniboxClient::IsPasteAndGoEnabled() const {
+  return true;
+}
+
 const SessionID& TestOmniboxClient::GetSessionID() const {
   return session_id_;
 }

components/omnibox/browser/test_omnibox_client.h

@@ -34,6 +34,7 @@ class TestOmniboxClient : public OmniboxClient {
       const base::string16& text,
       const AutocompleteMatch& match,
       const AutocompleteMatch& alternate_nav_match) override;
+  bool IsPasteAndGoEnabled() const override;
   const SessionID& GetSessionID() const override;
   const AutocompleteSchemeClassifier& GetSchemeClassifier() const override;
   AutocompleteClassifier* GetAutocompleteClassifier() override;