Make swarming dimensions for GPU bots explicit

scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py

Index: scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py b/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
index a780380409325b52282ebc7531687ba87e169956..a198afd611414187388c965bb080e6d274e4dea2 100644
--- a/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
+++ b/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
@@ -505,6 +505,9 @@ SPEC = {
         'platform': 'mac',
       },
       'enable_swarming': True,
+      'swarming_dimensions': {
+        'os': 'Mac-10.10',
+      },
     },
     'Mac 10.10 Debug (Intel)': {
       'chromium_config': 'chromium',
@@ -525,6 +528,9 @@ SPEC = {
         'platform': 'mac',
       },
       'enable_swarming': True,
+      'swarming_dimensions': {
+        'os': 'Mac-10.10',
+      },
     },
     'Mac 10.10 Release (ATI)': {
       'chromium_config': 'chromium',
@@ -631,6 +637,9 @@ SPEC = {
         'platform': 'mac',
       },
       'enable_swarming': True,
+      'swarming_dimensions': {
+        'os': 'Mac-10.10',
+      },
     },
     'Mac 10.10 Retina Debug (AMD)': {
       'chromium_config': 'chromium',
@@ -651,6 +660,9 @@ SPEC = {
         'platform': 'mac',
       },
       'enable_swarming': True,
+      'swarming_dimensions': {
+        'os': 'Mac-10.10',
+      },
     },
 
     'GPU Fake Linux Builder': {
@@ -775,6 +787,9 @@ SPEC = {
         'platform': 'mac',
       },
       'enable_swarming': True,
+      'swarming_dimensions': {
+        'os': 'Mac-10.10',
+      },
     },
     'Optional Mac Retina Release': {
       'chromium_config': 'chromium',
@@ -815,6 +830,9 @@ SPEC = {
         'platform': 'mac',
       },
       'enable_swarming': True,
+      'swarming_dimensions': {
+        'os': 'Mac-10.10',
+      },
     },
   },
 }