Reland "Disable some LayerTreeHostBlendingPixelTest on Linux, because flaky."

This is a reland of bd08401c92882ed1c69503217a67b17274439621
(Note that the original CL is no longer in the tree; it landed during yesterday's
Gerrit outage and was reset out of existence. So this is the first time it has
"officially" landed in the tree.)

Original change's description:
> Disable some LayerTreeHostBlendingPixelTest on Linux, because flaky.
>
> Disable on Linux
>
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassShadersWithMaskColorMatrixAA_GL
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassWithMaskColorMatrixAA_GL
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassWithMaskAA_GL
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassShadersWithMaskColorMatrix_GL_TextureRect
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassShadersColorMatrixAA_GL
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassShadersWithMaskColorMatrix_GL
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassShadersWithMaskAA_GL
> LayerTreeHostBlendingPixelTest.BlendingWithRenderPassColorMatrixAA_GL
>
> because flaky.
>
> TBR=ajuma@chromium.org
>
> Bug:872733
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I61a0b1cc99172da0437eec8f10149f0c46c966eb
> Reviewed-on: https://chromium-review.googlesource.com/1169204
> Reviewed-by: vitaliii <vitaliii@chromium.org>
> Commit-Queue: vitaliii <vitaliii@chromium.org>

TBR=ajuma@chromium.org

Bug: 872733
Change-Id: I044022d2db22b1cccb20692cf7300c3784ba2859
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1170543Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582085}

cc/trees/layer_tree_host_pixeltest_blending.cc

@@ -374,7 +374,16 @@ TEST_F(LayerTreeHostBlendingPixelTest,
       SOFTWARE, FILE_PATH_LITERAL("blending_render_pass_mask.png"), kUseMasks);
 }
 
-TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassWithMaskAA_GL) {
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if defined(OS_LINUX)
+#define MAYBE_BlendingWithRenderPassWithMaskAA_GL \
+  DISABLED_BlendingWithRenderPassWithMaskAA_GL
+#else
+#define MAYBE_BlendingWithRenderPassWithMaskAA_GL \
+  BlendingWithRenderPassWithMaskAA_GL
+#endif
+TEST_F(LayerTreeHostBlendingPixelTest,
+       MAYBE_BlendingWithRenderPassWithMaskAA_GL) {
   RunBlendingWithRenderPass(ZERO_COPY,
                             FILE_PATH_LITERAL("blending_render_pass_mask.png"),
                             kUseMasks | kUseAntialiasing);
@@ -399,7 +408,16 @@ TEST_F(LayerTreeHostBlendingPixelTest,
       SOFTWARE, FILE_PATH_LITERAL("blending_render_pass.png"), kUseColorMatrix);
 }
 
-TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassColorMatrixAA_GL) {
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if defined(OS_LINUX)
+#define MAYBE_BlendingWithRenderPassColorMatrixAA_GL \
+  DISABLED_BlendingWithRenderPassColorMatrixAA_GL
+#else
+#define MAYBE_BlendingWithRenderPassColorMatrixAA_GL \
+  BlendingWithRenderPassColorMatrixAA_GL
+#endif
+TEST_F(LayerTreeHostBlendingPixelTest,
+       MAYBE_BlendingWithRenderPassColorMatrixAA_GL) {
   RunBlendingWithRenderPass(ZERO_COPY,
                             FILE_PATH_LITERAL("blending_render_pass.png"),
                             kUseAntialiasing | kUseColorMatrix);
@@ -427,7 +445,8 @@ TEST_F(LayerTreeHostBlendingPixelTest,
 }
 
 // Often times out on Windows 10. See: https://crbug.com/870236.
-#if defined(OS_WIN)
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if (defined(OS_WIN) || defined(OS_LINUX))
 #define MAYBE_BlendingWithRenderPassWithMaskColorMatrixAA_GL \
   DISABLED_BlendingWithRenderPassWithMaskColorMatrixAA_GL
 #else
@@ -474,8 +493,16 @@ TEST_F(LayerTreeHostBlendingPixelTest,
                             kUseMasks | kForceShaders);
 }
 
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if defined(OS_LINUX)
+#define MAYBE_BlendingWithRenderPassShadersWithMaskAA_GL \
+  DISABLED_BlendingWithRenderPassShadersWithMaskAA_GL
+#else
+#define MAYBE_BlendingWithRenderPassShadersWithMaskAA_GL \
+  BlendingWithRenderPassShadersWithMaskAA_GL
+#endif
 TEST_F(LayerTreeHostBlendingPixelTest,
-       BlendingWithRenderPassShadersWithMaskAA_GL) {
+       MAYBE_BlendingWithRenderPassShadersWithMaskAA_GL) {
   RunBlendingWithRenderPass(ZERO_COPY,
                             FILE_PATH_LITERAL("blending_render_pass_mask.png"),
                             kUseMasks | kUseAntialiasing | kForceShaders);
@@ -495,29 +522,54 @@ TEST_F(LayerTreeHostBlendingPixelTest,
                             kUseColorMatrix | kForceShaders);
 }
 
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if defined(OS_LINUX)
+#define MAYBE_BlendingWithRenderPassShadersColorMatrixAA_GL \
+  DISABLED_BlendingWithRenderPassShadersColorMatrixAA_GL
+#else
+#define MAYBE_BlendingWithRenderPassShadersColorMatrixAA_GL \
+  BlendingWithRenderPassShadersColorMatrixAA_GL
+#endif
 TEST_F(LayerTreeHostBlendingPixelTest,
-       BlendingWithRenderPassShadersColorMatrixAA_GL) {
+       MAYBE_BlendingWithRenderPassShadersColorMatrixAA_GL) {
   RunBlendingWithRenderPass(ZERO_COPY,
                             FILE_PATH_LITERAL("blending_render_pass.png"),
                             kUseAntialiasing | kUseColorMatrix | kForceShaders);
 }
 
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if defined(OS_LINUX)
+#define MAYBE_BlendingWithRenderPassShadersWithMaskColorMatrix_GL \
+  DISABLED_BlendingWithRenderPassShadersWithMaskColorMatrix_GL
+#else
+#define MAYBE_BlendingWithRenderPassShadersWithMaskColorMatrix_GL \
+  BlendingWithRenderPassShadersWithMaskColorMatrix_GL
+#endif
 TEST_F(LayerTreeHostBlendingPixelTest,
-       BlendingWithRenderPassShadersWithMaskColorMatrix_GL) {
+       MAYBE_BlendingWithRenderPassShadersWithMaskColorMatrix_GL) {
   RunBlendingWithRenderPass(ZERO_COPY,
                             FILE_PATH_LITERAL("blending_render_pass_mask.png"),
                             kUseMasks | kUseColorMatrix | kForceShaders);
 }
 
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if defined(OS_LINUX)
+#define MAYBE_BlendingWithRenderPassShadersWithMaskColorMatrix_GL_TextureRect \
+  DISABLED_BlendingWithRenderPassShadersWithMaskColorMatrix_GL_TextureRect
+#else
+#define MAYBE_BlendingWithRenderPassShadersWithMaskColorMatrix_GL_TextureRect \
+  BlendingWithRenderPassShadersWithMaskColorMatrix_GL_TextureRect
+#endif
 TEST_F(LayerTreeHostBlendingPixelTest,
-       BlendingWithRenderPassShadersWithMaskColorMatrix_GL_TextureRect) {
+       MAYBE_BlendingWithRenderPassShadersWithMaskColorMatrix_GL_TextureRect) {
   RunBlendingWithRenderPass(ZERO_COPY,
                             FILE_PATH_LITERAL("blending_render_pass_mask.png"),
                             kUseMasks | kUseColorMatrix | kForceShaders);
 }
 
 // Often times out on Windows 10. See: https://crbug.com/870236.
-#if defined(OS_WIN)
+// Fails on Linux CFI, see https://crbug.com/872733.
+#if (defined(OS_WIN) || defined(OS_LINUX))
 #define MAYBE_BlendingWithRenderPassShadersWithMaskColorMatrixAA_GL \
   DISABLED_BlendingWithRenderPassShadersWithMaskColorMatrixAA_GL
 #else