clang-formats remaining files and adds a presubmit check.

runtime/vm/snapshot_test.cc

Index: runtime/vm/snapshot_test.cc
diff --git a/runtime/vm/snapshot_test.cc b/runtime/vm/snapshot_test.cc
index cbe7009aaf015cf7bff16b3f4b5b9f3c67ca8d92..81c43420b34ac547827610b350e5cffa14be0cb2 100644
--- a/runtime/vm/snapshot_test.cc
+++ b/runtime/vm/snapshot_test.cc
@@ -1635,8 +1635,7 @@ UNIT_TEST_CASE(ScriptSnapshot2) {
 
 
 UNIT_TEST_CASE(MismatchedSnapshotKinds) {
-  const char* kScriptChars =
-      "main() { print('Hello, world!'); }";
+  const char* kScriptChars = "main() { print('Hello, world!'); }";
   Dart_Handle result;
 
   uint8_t* buffer;
@@ -1657,10 +1656,8 @@ UNIT_TEST_CASE(MismatchedSnapshotKinds) {
     Dart_EnterScope();  // Start a Dart API scope for invoking API functions.
 
     // Write out the script snapshot.
-    result = Dart_CreateSnapshot(NULL,
-                                 &vm_isolate_snapshot_size,
-                                 &isolate_snapshot,
-                                 &isolate_snapshot_size);
+    result = Dart_CreateSnapshot(NULL, &vm_isolate_snapshot_size,
+                                 &isolate_snapshot, &isolate_snapshot_size);
     EXPECT_VALID(result);
     full_snapshot = reinterpret_cast<uint8_t*>(malloc(isolate_snapshot_size));
     memmove(full_snapshot, isolate_snapshot, isolate_snapshot_size);
@@ -1692,9 +1689,8 @@ UNIT_TEST_CASE(MismatchedSnapshotKinds) {
   {
     // Use a script snapshot where a full snapshot is expected.
     char* error = NULL;
-    Dart_Isolate isolate = Dart_CreateIsolate("script-uri", "main",
-                                              script_snapshot, NULL, NULL,
-                                              &error);
+    Dart_Isolate isolate = Dart_CreateIsolate(
+        "script-uri", "main", script_snapshot, NULL, NULL, &error);
     EXPECT(isolate == NULL);
     EXPECT(error != NULL);
     EXPECT_SUBSTRING("got 'script', expected 'core'", error);
@@ -1706,8 +1702,9 @@ UNIT_TEST_CASE(MismatchedSnapshotKinds) {
 
     // Use a full snapshot where a script snapshot is expected.
     Dart_Handle result = Dart_LoadScriptFromSnapshot(full_snapshot, size);
-    EXPECT_ERROR(result, "Dart_LoadScriptFromSnapshot expects parameter"
-                         " 'buffer' to be a script type snapshot.");
+    EXPECT_ERROR(result,
+                 "Dart_LoadScriptFromSnapshot expects parameter"
+                 " 'buffer' to be a script type snapshot.");
 
     Dart_ExitScope();
   }