Valgrind: Restore a suppression that got accidentally removed.

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1350 matching lines @@
    fun:_ZN15tracked_objects10ThreadData23InitializeThreadContextERKSs
    fun:_ZN4base14PlatformThread7SetNameEPKc
 }
 {
    bug_111669
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN8appcache17AppCacheDiskCache10ActiveCall17OnAsyncCompletionEi
 }
 {
+   bug_112278
+   Memcheck:Uninitialized
+   fun:fetch_texel_2d_f_rgba8888
+   ...
+   fun:sample_nearest_2d
+   fun:fetch_texel_lod
+   fun:fetch_texel
+   fun:_mesa_execute_program
+   fun:run_program*
+   fun:_swrast_exec_fragment_program
+   fun:shade_texture_span
+   fun:_swrast_write_rgba_span
+   fun:general_triangle
+   ...
+   fun:_swrast_Triangle
+   fun:triangle_rgba
+   ...
+   fun:run_render
+   fun:_tnl_run_pipeline
+   fun:_tnl_draw_prims
+   fun:_tnl_vbo_draw_prims
+}
+{
    bug_122457
    Memcheck:Leak
    fun:malloc
    fun:_ZN3WTF10fastMallocEm
    fun:_ZN3WTF10RefCountedIN5blink12MHTMLArchiveEEnwEm
    fun:_ZN5blink12MHTMLArchive6createEv
    ...
    fun:_ZN5blink11MHTMLParser22parseArchiveWithHeaderEPNS_10MIMEHeaderE
    fun:_ZN5blink11MHTMLParser12parseArchiveEv
    fun:_ZN5blink12MHTMLArchive6createERKNS_4KURLEPNS_12SharedBufferE
@@ skipping 2042 matching lines @@
    fun:_ZNK7storage24SandboxFileSystemBackend25CreateFileSystemOperationERKNS_13FileSystemURLEPNS_17FileSystemContextEPN4base4File5ErrorE
    fun:_ZN7storage17FileSystemContext25CreateFileSystemOperationERKNS_13FileSystemURLEPN4base4File5ErrorE
 }
 {
    bug_417526
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4base19SequencedWorkerPoolC1EmRKSs
    fun:_ZN16sync_file_system13drive_backend14SyncEngineTest5SetUpEv
 }