Double timeout of single_process_mash_browser_tests

It may make sense to increase the number of shards instead but I am not
sufficiently knowledgable of capacity planning to do this change.

The reason for increasing the timeout is that this bot times out consistently.

TBR=rcui@chromium.org,sky@chromium.org

Bug: 874090
BUG: 847585
Change-Id: I14f9d2eccbead7ef403e346deda5442a82d5ea27
Reviewed-on: https://chromium-review.googlesource.com/1215283Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589864}

internal_gyp @ 128f0231

+Subproject commit 128f0231ca813adf99c95acb37056dadfb9f50e7

testing/buildbot/chromium.chromiumos.json

@@ -479,7 +479,7 @@
         "name": "single_process_mash_browser_tests",
         "swarming": {
           "can_use_on_swarming_builders": true,
-          "hard_timeout": 1800,
+          "hard_timeout": 3600,
           "shards": 10
         },
         "test": "browser_tests"
@@ -1169,7 +1169,7 @@
         "name": "single_process_mash_browser_tests",
         "swarming": {
           "can_use_on_swarming_builders": true,
-          "hard_timeout": 1800,
+          "hard_timeout": 3600,
           "shards": 10
         },
         "test": "browser_tests"

testing/buildbot/chromium.memory.json

@@ -4292,7 +4292,7 @@
         "name": "single_process_mash_browser_tests",
         "swarming": {
           "can_use_on_swarming_builders": true,
-          "hard_timeout": 1800,
+          "hard_timeout": 3600,
           "shards": 10
         },
         "test": "browser_tests"
@@ -4982,7 +4982,7 @@
         "name": "single_process_mash_browser_tests",
         "swarming": {
           "can_use_on_swarming_builders": true,
-          "hard_timeout": 1800,
+          "hard_timeout": 3600,
           "shards": 10
         },
         "test": "browser_tests"

testing/buildbot/test_suites.pyl

@@ -1899,7 +1899,7 @@
         '--test-launcher-filter-file=../../testing/buildbot/filters/chromeos.single_process_mash.browser_tests.filter',
       ],
       'swarming': {
-        'hard_timeout': 1800,
+        'hard_timeout': 3600,
         'shards': 10,
       },
     },