Add CertIssuerSource interface and CertIssuerSourceStatic implementation.

net/net.gypi

Index: net/net.gypi
diff --git a/net/net.gypi b/net/net.gypi
index ea7bc65e90ee5e649b19f2017ca54164162cc80a..dc9db7ab4584183d531fb15756cdd18784ebdbd5 100644
--- a/net/net.gypi
+++ b/net/net.gypi
@@ -86,6 +86,9 @@
       'cert/ct_verifier.h',
       'cert/ct_verify_result.cc',
       'cert/ct_verify_result.h',
+      'cert/internal/cert_issuer_source.h',
+      'cert/internal/cert_issuer_source_static.cc',
+      'cert/internal/cert_issuer_source_static.h',
       'cert/internal/certificate_policies.cc',
       'cert/internal/certificate_policies.h',
       'cert/internal/extended_key_usage.cc',
@@ -1373,6 +1376,7 @@
       'cert/ct_objects_extractor_unittest.cc',
       'cert/ct_serialization_unittest.cc',
       'cert/ev_root_ca_metadata_unittest.cc',
+      'cert/internal/cert_issuer_source_static_unittest.cc',
       'cert/internal/certificate_policies_unittest.cc',
       'cert/internal/extended_key_usage_unittest.cc',
       'cert/internal/name_constraints_unittest.cc',
@@ -2173,6 +2177,13 @@
     # List of test data files for //net:net_unittests. Can be regenerated by
     # running net/data/update_net_gypi.py.
     'net_unittests_data_sources': [
+      'data/cert_issuer_source_static_unittest/c1.pem',
+      'data/cert_issuer_source_static_unittest/c2.pem',
+      'data/cert_issuer_source_static_unittest/d.pem',
+      'data/cert_issuer_source_static_unittest/i1_1.pem',
+      'data/cert_issuer_source_static_unittest/i1_2.pem',
+      'data/cert_issuer_source_static_unittest/i2.pem',
+      'data/cert_issuer_source_static_unittest/root.pem',
       'data/certificate_policies_unittest/anypolicy.pem',
       'data/certificate_policies_unittest/anypolicy_with_qualifier.pem',
       'data/certificate_policies_unittest/invalid-anypolicy_with_custom_qualifier.pem',