Reduce swarming priority of the ANGLE dEQP tests.

testing/buildbot/chromium.gpu.fyi.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See generate_buildbot_json.py to make changes": {},
   "GPU Linux Builder": {},
   "GPU Linux Builder (dbg)": {},
   "GPU Mac Builder": {},
   "GPU Mac Builder (dbg)": {},
   "GPU Win Builder": {},
   "GPU Win Builder (dbg)": {},
   "GPU Win x64 Builder": {},
@@ skipping 1672 matching lines @@
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Linux"
             }
           ],
+          "expiration": 7200,
+          "priority_adjustment": "lower",
           "shards": 4
         },
         "test": "angle_deqp_gles2_tests",
         "use_xvfb": false
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Linux"
             }
           ],
+          "expiration": 7200,
+          "priority_adjustment": "lower",
           "shards": 12
         },
         "test": "angle_deqp_gles3_tests",
         "use_xvfb": false
       },
       {
         "args": [
           "--use-gpu-in-tests"
         ],
         "swarming": {
@@ skipping 3648 matching lines @@
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Linux"
             }
           ],
+          "expiration": 7200,
+          "priority_adjustment": "lower",
           "shards": 4
         },
         "test": "angle_deqp_gles2_tests",
         "use_xvfb": false
       },
       {
         "args": [
           "--use-gpu-in-tests"
         ],
         "swarming": {
@@ skipping 269 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Windows-2008ServerR2-SP1"
             }
           ],
+          "expiration": 7200,
+          "priority_adjustment": "lower",
           "shards": 4
         },
         "test": "angle_deqp_gles2_tests",
         "use_xvfb": false
       },
       {
         "args": [
           "--use-gpu-in-tests"
         ],
         "swarming": {
@@ skipping 2417 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Windows-2008ServerR2-SP1"
             }
           ],
+          "expiration": 7200,
+          "priority_adjustment": "lower",
           "shards": 4
         },
         "test": "angle_deqp_gles2_tests",
         "use_xvfb": false
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Windows-2008ServerR2-SP1"
             }
           ],
+          "expiration": 7200,
+          "priority_adjustment": "lower",
           "shards": 12
         },
         "test": "angle_deqp_gles3_tests",
         "use_xvfb": false
       },
       {
         "args": [
           "--use-gpu-in-tests"
         ],
         "swarming": {
@@ skipping 963 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Windows-2008ServerR2-SP1"
             }
           ],
+          "expiration": 7200,
+          "priority_adjustment": "lower",
           "shards": 4
         },
         "test": "angle_deqp_gles2_tests",
         "use_xvfb": false
       },
       {
         "args": [
           "--use-gpu-in-tests"
         ],
         "swarming": {
@@ skipping 1426 matching lines @@
             {
               "gpu": "10de:104a",
               "os": "Windows-2012ServerR2-SP0"
             }
           ]
         }
       }
     ]
   }
 }