cros: Enhanced Clipboard

This seems large, but a lot of this is boiler
plate, moved files, or vector icons.

This feature is a productivity experiment.
The basics are:
 - Copy some things, per usual.
 - Press search + v to see a small menu showing
   previously copied things.
 - Select one of the previously copied things,
   the result will be that it is pasted into the
   active window.

Known issues:
 - Some webapps render their text input in an
   IFrame, and we cannot know where the caret is.
    - https://crbug.com/1099930

Metrics and more tests will be in the next CL.

Bug: 1095209, 1099309
Change-Id: Icb8a44cec5ad038ddfdb2889c71fa89065ac8138
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274463
Commit-Queue: Alex Newcomer <[email protected]>
Reviewed-by: Darwin Huang <[email protected]>
Reviewed-by: Xiyuan Xia <[email protected]>
Cr-Commit-Position: refs/heads/master@{#787350}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 80bac93..1c37bcf 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2085,6 +2085,9 @@
 extern const char kDragToSnapInClamshellModeName[];
 extern const char kDragToSnapInClamshellModeDescription[];
 
+extern const char kEnhancedClipboardName[];
+extern const char kEnhancedClipboardDescription[];
+
 extern const char kMultiDisplayOverviewAndSplitViewName[];
 extern const char kMultiDisplayOverviewAndSplitViewDescription[];