Enable media_perftests continuous runs on windows and mac.

tools/perf/generate_perf_json.py

Index: tools/perf/generate_perf_json.py
diff --git a/tools/perf/generate_perf_json.py b/tools/perf/generate_perf_json.py
index 348ba22d80929adb4deaaf5d0da3fe7d16ac74b9..76ca33f47a864d09a26a3c9c5a95e23239e5ee99 100755
--- a/tools/perf/generate_perf_json.py
+++ b/tools/perf/generate_perf_json.py
@@ -251,7 +251,9 @@ def get_waterfall_config():
        'device_ids': [
            'build132-m1', 'build133-m1',
            'build134-m1', 'build135-m1', 'build136-m1'
-          ]
+          ],
+       'perf_tests': [
+         ('media_perftests', 2)]
       }
     ])
   waterfall = add_tester(
@@ -266,7 +268,8 @@ def get_waterfall_config():
           ],
        'perf_tests': [
          ('load_library_perf_tests', 2),
-         ('performance_browser_tests', 2)]
+         ('performance_browser_tests', 2),
+         ('media_perftests', 3)]
       }
     ])
   waterfall = add_tester(
@@ -282,7 +285,8 @@ def get_waterfall_config():
           ],
        'perf_tests': [
          ('load_library_perf_tests', 2),
-         ('performance_browser_tests', 2)]
+         ('performance_browser_tests', 2),
+         ('media_perftests', 3)]
       }
     ])
   waterfall = add_tester(
@@ -315,7 +319,8 @@ def get_waterfall_config():
        'perf_tests': [
          ('angle_perftests', 2),
          ('load_library_perf_tests', 2),
-         ('performance_browser_tests', 2)]
+         ('performance_browser_tests', 2),
+         ('media_perftests', 3)]
       }
     ])
   waterfall = add_tester(
@@ -345,7 +350,8 @@ def get_waterfall_config():
        'perf_tests': [
          ('angle_perftests', 2),
          ('load_library_perf_tests', 2),
-         ('performance_browser_tests', 2)]
+         ('performance_browser_tests', 2),
+         ('media_perftests', 3)]
       }
     ])
 
@@ -359,7 +365,9 @@ def get_waterfall_config():
        'device_ids': [
            'build102-b1', 'build103-b1',
            'build104-b1', 'build105-b1', 'build106-b1'
-          ]
+          ],
+       'perf_tests': [
+         ('media_perftests', 3)]
       }
     ])
   waterfall = add_tester(