Valgrind Mac: Restore a couple suppressions that are still active.

BUG=173779,257276
NOTRY=true
TBR=oshima@chromium.org

Review URL: https://codereview.chromium.org/601143002

Cr-Commit-Position: refs/heads/master@{#296681}

tools/valgrind/memcheck/suppressions_mac.txt

@@ -94,6 +94,17 @@
    fun:__CFRunLoopRun
    ...
 }
+# Intentional leaks in AppKit, for an OS-level cache. Only appear on the first
+# run of each reboot.  See also issues 105525, 257276, 340847.
+{
+   bug_257276_b
+   Memcheck:Leak
+   fun:malloc_zone_malloc
+   ...
+   fun:setCursorFromBundle
+   fun:CoreCursorSet
+   fun:-[NSCursor set]
+}
 
 # 2. Intentional unit test errors, stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing.
@@ -161,6 +172,18 @@
    fun:_ZN9Offscreen5getCGERK19SkScalerContext_MacRK7SkGlyphtPmb
    fun:_ZN19SkScalerContext_Mac13generateImageERK7SkGlyph
 }
+{
+   bug_173779
+   Memcheck:Uninitialized
+   ...
+   fun:img_data_lock
+   fun:CGSImageDataLock
+   fun:ripc_AcquireImage
+   fun:ripc_DrawImage*
+   fun:CGContextDrawImage*
+   ...
+   fun:_ZN11CUIRenderer4DrawE6CGRectP9CGContextPK14__CFDictionaryPS5_
+}
 {
   bug_340726
   Memcheck:Leak