Android: Create a chrome flag for drawing vertically full contents

The newly added flags, if turned on, draws contents vertically from edge
to edge.

Bug: 937946
Change-Id: I65676bb52b6daf3d788cea145ded8dd3ed4fca9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1528063
Commit-Queue: Jinsuk Kim <[email protected]>
Reviewed-by: Theresa <[email protected]>
Cr-Commit-Position: refs/heads/master@{#642781}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 6657f67..2828253a 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -172,6 +172,9 @@
 extern const char kDelegateOverscrollSwipesName[];
 extern const char kDelegateOverscrollSwipesDescription[];
 
+extern const char kDrawVerticallyEdgeToEdgeName[];
+extern const char kDrawVerticallyEdgeToEdgeDescription[];
+
 extern const char kExperimentalAccessibilityFeaturesName[];
 extern const char kExperimentalAccessibilityFeaturesDescription[];