Make Wire tests more strict w.r.t. expectations

This changes Wire tests to produces errors on "uninteresting calls" and
flushes mock expectations on client/server flushes so that we control
100% of the order of calls.

BUG=941543

Change-Id: I6eabc79dde2abb564e54df90c5c0e615fd4496c6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/6040
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>

generator/templates/mock_api.cpp

@@ -14,6 +14,8 @@
 
 #include "mock_dawn.h"
 
+using namespace testing;
+
 namespace {
     {% for type in by_category["object"] %}
         {% for method in native_methods(type) if len(method.arguments) < 10 %}
@@ -128,3 +130,9 @@ void ProcTableAsClass::CallFenceOnCompletionCallback(DawnFence fence,
 
 MockProcTable::MockProcTable() {
 }
+
+void MockProcTable::IgnoreAllReleaseCalls() {
+    {% for type in by_category["object"] %}
+        EXPECT_CALL(*this, {{as_MethodSuffix(type.name, Name("release"))}}(_)).Times(AnyNumber());
+    {% endfor %}
+}