[inspector_protocol] Support features for content/ generator.

lib/DispatcherBase_cpp.template

Index: lib/DispatcherBase_cpp.template
diff --git a/lib/DispatcherBase_cpp.template b/lib/DispatcherBase_cpp.template
index 9095cbc961c7761406eb58c76264cf13e9b1f128..b08947aba43f32c1da32a290560dcbd32471e306 100644
--- a/lib/DispatcherBase_cpp.template
+++ b/lib/DispatcherBase_cpp.template
@@ -39,6 +39,16 @@ DispatchResponse DispatchResponse::InternalError()
 }
 
 // static
+DispatchResponse DispatchResponse::InvalidParams(const String& error)
+{
+    DispatchResponse result;
+    result.m_status = kError;
+    result.m_errorCode = kInvalidParams;
+    result.m_errorMessage = error;
+    return result;
+}
+
+// static
 DispatchResponse DispatchResponse::FallThrough()
 {
     DispatchResponse result;
@@ -58,9 +68,10 @@ DispatcherBase::WeakPtr::~WeakPtr()
         m_dispatcher->m_weakPtrs.erase(this);
 }
 
-DispatcherBase::Callback::Callback(std::unique_ptr<DispatcherBase::WeakPtr> backendImpl, int callId)
+DispatcherBase::Callback::Callback(std::unique_ptr<DispatcherBase::WeakPtr> backendImpl, int callId, int callbackId)
     : m_backendImpl(std::move(backendImpl))
-    , m_callId(callId) { }
+    , m_callId(callId)
+    , m_callbackId(callbackId) { }
 
 DispatcherBase::Callback::~Callback() = default;
 
@@ -77,14 +88,36 @@ void DispatcherBase::Callback::sendIfActive(std::unique_ptr<protocol::Dictionary
     m_backendImpl = nullptr;
 }
 
+void DispatcherBase::Callback::fallThroughIfActive()
+{
+    if (!m_backendImpl || !m_backendImpl->get())
+        return;
+    m_backendImpl->get()->markFallThrough(m_callbackId);
+    m_backendImpl = nullptr;
+}
+
 DispatcherBase::DispatcherBase(FrontendChannel* frontendChannel)
-    : m_frontendChannel(frontendChannel) { }
+    : m_frontendChannel(frontendChannel)
+    , m_lastCallbackId(0)
+    , m_lastCallbackFallThrough(false) { }
 
 DispatcherBase::~DispatcherBase()
 {
     clearFrontend();
 }
 
+int DispatcherBase::nextCallbackId()
+{
+    m_lastCallbackFallThrough = false;
+    return ++m_lastCallbackId;
+}
+
+void DispatcherBase::markFallThrough(int callbackId)
+{
+    DCHECK(callbackId == m_lastCallbackId);
+    m_lastCallbackFallThrough = true;
+}
+
 // static
 bool DispatcherBase::getCommandName(const String& message, String* result)
 {
@@ -169,7 +202,13 @@ std::unique_ptr<DispatcherBase::WeakPtr> DispatcherBase::weakPtr()
 }
 
 UberDispatcher::UberDispatcher(FrontendChannel* frontendChannel)
-    : m_frontendChannel(frontendChannel) { }
+    : m_frontendChannel(frontendChannel)
+    , m_fallThroughForNotFound(false) { }
+
+void UberDispatcher::setFallThroughForNotFound(bool fallThroughForNotFound)
+{
+    m_fallThroughForNotFound = fallThroughForNotFound;
+}
 
 void UberDispatcher::registerBackend(const String& name, std::unique_ptr<protocol::DispatcherBase> dispatcher)
 {
@@ -206,12 +245,16 @@ DispatchResponse::Status UberDispatcher::dispatch(std::unique_ptr<Value> parsedM
 
     size_t dotIndex = method.find(".");
     if (dotIndex == StringUtil::kNotFound) {
+        if (m_fallThroughForNotFound)
+            return DispatchResponse::kFallThrough;
         reportProtocolErrorTo(m_frontendChannel, callId, DispatchResponse::kMethodNotFound, "'" + method + "' wasn't found", nullptr);
         return DispatchResponse::kError;
     }
     String domain = StringUtil::substring(method, 0, dotIndex);
     auto it = m_dispatchers.find(domain);
     if (it == m_dispatchers.end()) {
+        if (m_fallThroughForNotFound)
+            return DispatchResponse::kFallThrough;
         reportProtocolErrorTo(m_frontendChannel, callId, DispatchResponse::kMethodNotFound, "'" + method + "' wasn't found", nullptr);
         return DispatchResponse::kError;
     }