[Flaky][Linux] Mark more decode-resize.js tests flaky

The failures affect all versions of decode-resize.js but the new
expectations cover only http/tests/devtools/tracing/decode-resize.js.

With this CL, all expectations are as well applied to
virtual/threaded/http/tests/devtools/tracing/decode-resize.js

TBR=caseq@chromium.org

Bug: 847114
Change-Id: I35c53f7e2852afcf6bb0c82369a52845e73351ba
Reviewed-on: https://chromium-review.googlesource.com/1181055Reviewed-by: Friedrich Horschig <fhorschig@chromium.org>
Commit-Queue: Friedrich Horschig <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584427}

third_party/WebKit/LayoutTests/LeakExpectations

@@ -84,6 +84,7 @@ crbug.com/874442 [ Linux ] svg/animations/mpath-remove-from-dependents-on-delete
 
 # Sheriff 2018-08-17
 crbug.com/847114 [ Linux ] http/tests/devtools/tracing/decode-resize.js [ Pass Failure ]
+crbug.com/847114 [ Linux ] virtual/threaded/http/tests/devtools/tracing/decode-resize.js [ Pass Failure ]
 
 ###########################################################################
 # WARNING: Memory leaks must be fixed asap. Sheriff is expected to revert #

third_party/WebKit/LayoutTests/TestExpectations

@@ -4640,6 +4640,7 @@ crbug.com/846982 http/tests/devtools/editor/text-editor-formatter.js [ Timeout P
 crbug.com/847094 [ Mac ] virtual/new-remote-playback-pipeline/media/controls/modern/tap-to-hide-controls.html [ Skip ]
 crbug.com/846981 fast/webgl/texImage-imageBitmap-from-imageData-resize.html [ Pass Timeout ]
 crbug.com/847114 [ Linux ] http/tests/devtools/tracing/decode-resize.js [ Pass Failure ]
+crbug.com/847114 [ Linux ] virtual/threaded/http/tests/devtools/tracing/decode-resize.js [ Pass Failure ]
 
 crbug.com/843135 virtual/gpu/fast/canvas/canvas-arc-circumference-fill.html [ Pass Failure ]