Suppress GDI usage errors in drag_utils::SetDragImageOnDataObject

TBR=ananta@chromium.org
BUG=573352
NOTRY=true

Review URL: https://codereview.chromium.org/1552913002

Cr-Commit-Position: refs/heads/master@{#367232}

tools/valgrind/drmemory/suppressions.txt

@@ -812,3 +812,10 @@ system call NtDuplicateObject
 *!content::ChildProcessLauncher::Notify
 *!content::ChildProcessLauncher::DidLaunch
 *!base::internal::InvokeHelper<>::MakeItSo
+
+GDI USAGE ERROR
+name=bug_573352
+system call NtGdiDeleteObjectApp
+GDI32.dll!...
+SHELL32.dll!...
+ui_base.dll!drag_utils::SetDragImageOnDataObject