Deflake css3/filter/effect layout tests

third_party/WebKit/LayoutTests/css3/filters/effect-brightness-clamping-hw.html

Index: third_party/WebKit/LayoutTests/css3/filters/effect-brightness-clamping-hw.html
diff --git a/third_party/WebKit/LayoutTests/css3/filters/effect-brightness-clamping-hw.html b/third_party/WebKit/LayoutTests/css3/filters/effect-brightness-clamping-hw.html
index 17d9e32ca2ec4aade4d522c68a57a3d69c4b3d9e..3c8876814291e2a68e4ffc2cfedeb9ec2c1d9f19 100644
--- a/third_party/WebKit/LayoutTests/css3/filters/effect-brightness-clamping-hw.html
+++ b/third_party/WebKit/LayoutTests/css3/filters/effect-brightness-clamping-hw.html
@@ -1,17 +1,23 @@
+<!-- This test uses a particular image size to avoid hitting flakiness in mesa texture sampling.  See http://crbug.com/621892 for more details. -->
 <style>
 img {
     transform:translateZ(0);
 }
+div {
+    width: 160px;
+    height: 90px;
+    display: inline-block;
+}
 </style>
-<img style="filter: brightness(1) brightness(2)" src="resources/reference.png">
-<img style="filter: brightness(0.2) brightness(1.8)" src="resources/reference.png">
-<img style="filter: brightness(0.5) brightness(1.5)" src="resources/reference.png">
-<img style="filter: brightness(0.8) brightness(1.2)" src="resources/reference.png">
-<img style="filter: brightness(1.2) brightness(0.8)" src="resources/reference.png">
-<img style="filter: brightness(1.5) brightness(0.5)" src="resources/reference.png">
-<img style="filter: brightness(1.8) brightness(0.2)" src="resources/reference.png">
-<img style="filter: brightness(1) brightness(1)" src="resources/reference.png">
-<img style="filter: brightness(0.8) grayscale(1)" src="resources/reference.png">
-<img style="filter: brightness(0.5) blur(3px)" src="resources/reference.png">
-<img style="filter: brightness(1) blur(3px)" src="resources/reference.png">
-<img style="filter: brightness(0.5) drop-shadow(5px 5px 5px red)" src="resources/reference.png">
+<div><img style="filter: brightness(1) brightness(2)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(0.2) brightness(1.8)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(0.5) brightness(1.5)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(0.8) brightness(1.2)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(1.2) brightness(0.8)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(1.5) brightness(0.5)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(1.8) brightness(0.2)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(1) brightness(1)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(0.8) grayscale(1)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(0.5) blur(3px)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(1) blur(3px)" src="resources/reference_square.png"></div>
+<div><img style="filter: brightness(0.5) drop-shadow(5px 5px 5px red)" src="resources/reference_square.png"></div>