Re-enable key silk case benchmarks on Android

tools/perf/benchmarks/smoothness.py

Index: tools/perf/benchmarks/smoothness.py
diff --git a/tools/perf/benchmarks/smoothness.py b/tools/perf/benchmarks/smoothness.py
index a25527c688c149eab35fa6ddc59c1c90b636f4c4..e98e6f1e295f7fab8831fcb455a80f7ec0ac6074 100644
--- a/tools/perf/benchmarks/smoothness.py
+++ b/tools/perf/benchmarks/smoothness.py
@@ -47,7 +47,6 @@ class SmoothnessToughAnimationCases(test.Test):
   page_set = 'page_sets/tough_animation_cases.py'
 
 
-@test.Disabled('android')  # crbug.com/355952
 class SmoothnessKeySilkCases(test.Test):
   """Measures rendering statistics for the key silk cases without GPU
   rasterization
@@ -56,7 +55,6 @@ class SmoothnessKeySilkCases(test.Test):
   page_set = 'page_sets/key_silk_cases.py'
 
 
-@test.Disabled('android')  # crbug.com/355952
 class SmoothnessFastPathKeySilkCases(test.Test):
   """Measures rendering statistics for the key silk cases without GPU
   rasterization using bleeding edge rendering fast paths.
@@ -91,7 +89,6 @@ class SmoothnessGpuRasterizationKeyMobileSites(test.Test):
     silk_flags.CustomizeBrowserOptionsForGpuRasterization(options)
 
 
-@test.Disabled('android')  # crbug.com/355952
 class SmoothnessGpuRasterizationKeySilkCases(test.Test):
   """Measures rendering statistics for the key silk cases with GPU rasterization
   """
@@ -102,7 +99,6 @@ class SmoothnessGpuRasterizationKeySilkCases(test.Test):
     silk_flags.CustomizeBrowserOptionsForGpuRasterization(options)
 
 
-@test.Disabled('android')  # crbug.com/355952
 class SmoothnessFastPathGpuRasterizationKeySilkCases(
     SmoothnessGpuRasterizationKeySilkCases):
   """Measures rendering statistics for the key silk cases with GPU rasterization