Make BookmarkContextMenuTest and BookmarkContextMenuControllerTest use test clipboard.

Unit tests shouldn't use system clipboard because clipboard is a global resource.

Bug: 963112
Change-Id: I2c32042dac0aee6f91418b5f7b8099c018aef55a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625942
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663132}

chrome/browser/ui/bookmarks/bookmark_context_menu_controller_unittest.cc

@@ -27,6 +27,7 @@
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/clipboard/clipboard.h"
+#include "ui/base/clipboard/test/test_clipboard.h"
 
 using base::ASCIIToUTF16;
 using bookmarks::BookmarkModel;
@@ -58,6 +59,8 @@ class BookmarkContextMenuControllerTest : public testing::Test {
     model_ = BookmarkModelFactory::GetForBrowserContext(profile_.get());
     bookmarks::test::WaitForBookmarkModelToLoad(model_);
     AddTestData(model_);
+    // CutCopyPasteNode executes IDC_CUT and IDC_COPY commands.
+    ui::TestClipboard::CreateForCurrentThread();
   }
 
   void TearDown() override {

chrome/browser/ui/views/bookmarks/bookmark_context_menu_unittest.cc

@@ -32,6 +32,7 @@
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/clipboard/clipboard.h"
+#include "ui/base/clipboard/test/test_clipboard.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/views/controls/menu/menu_item_view.h"
 
@@ -74,6 +75,8 @@ class BookmarkContextMenuTest : public testing::Test {
     bookmarks::test::WaitForBookmarkModelToLoad(model_);
 
     AddTestData();
+    // CutCopyPasteNode executes IDC_COPY and IDC_CUT commands.
+    ui::TestClipboard::CreateForCurrentThread();
   }
 
   void TearDown() override {