Move renderer plugin code into a new component.

components/components_tests.gypi

Index: components/components_tests.gypi
diff --git a/components/components_tests.gypi b/components/components_tests.gypi
index 910d2e615ffa63b6fd9aa09278e93ae9ecefbe98..85579320d5aff0592bfc8ba7c7092befe7ab3b8b 100644
--- a/components/components_tests.gypi
+++ b/components/components_tests.gypi
@@ -19,6 +19,7 @@
             'json_schema/json_schema_validator_unittest_base.cc',
             'json_schema/json_schema_validator_unittest_base.h',
             'navigation_interception/intercept_navigation_resource_throttle_unittest.cc',
+            'plugins/renderer/plugin_uma_unittest.cc',
             'sessions/serialized_navigation_entry_unittest.cc',
             'test/run_all_unittests.cc',
             # TODO(asvitkine): These should be tested on iOS too.
@@ -58,6 +59,9 @@
             '../content/content.gyp:test_support_content',
             '../skia/skia.gyp:skia',
             'navigation_interception',
+            
+            # Dependecies of plugins
+            'plugins_renderer',
 
             # Dependencies of policy
             'policy_component',