[DevTools] Remove last bits of logic from v8 agent wrappers.

third_party/WebKit/Source/platform/v8_inspector/V8DebuggerAgentImpl.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/v8_inspector/V8DebuggerAgentImpl.h"
 
 #include "platform/inspector_protocol/String16.h"
 #include "platform/inspector_protocol/Values.h"
 #include "platform/v8_inspector/InjectedScript.h"
 #include "platform/v8_inspector/InspectedContext.h"
@@ skipping 192 matching lines @@
     // FIXME(WK44513): breakpoints activated flag should be synchronized between all front-ends
     debugger().setBreakpointsActivated(true);
     m_session->changeInstrumentationCounter(+1);
 }
 
 bool V8DebuggerAgentImpl::enabled()
 {
     return m_enabled;
 }
 
-void V8DebuggerAgentImpl::enable(ErrorString*)
+void V8DebuggerAgentImpl::enable(ErrorString* errorString)
 {
     if (enabled())
         return;
 
+    if (!m_session->client()->canExecuteScripts()) {
+        *errorString = "Script execution is prohibited";
+        return;
+    }
+
     enable();
-
     ASSERT(m_frontend);
 }
 
 void V8DebuggerAgentImpl::disable(ErrorString*)
 {
     if (!enabled())
         return;
     m_session->changeInstrumentationCounter(-1);
 
     m_state->setObject(DebuggerAgentState::javaScriptBreakpoints, protocol::DictionaryValue::create());
@@ skipping 44 matching lines @@
 {
     ErrorString error;
     disable(&error);
     ASSERT(m_frontend);
     m_frontend = nullptr;
 }
 
 void V8DebuggerAgentImpl::restore()
 {
     ASSERT(!m_enabled);
+    if (!m_session->client()->canExecuteScripts())
+        return;
+
     enable();
     ErrorString error;
 
     int pauseState = V8DebuggerImpl::DontPauseOnExceptions;
     m_state->getNumber(DebuggerAgentState::pauseOnExceptionsState, &pauseState);
     setPauseOnExceptionsImpl(&error, pauseState);
     ASSERT(error.isEmpty());
 
     m_skipAllPauses = m_state->booleanProperty(DebuggerAgentState::skipAllPauses, false);
 
@@ skipping 1153 matching lines @@
     if (!enabled())
         return;
     m_scheduledDebuggerStep = NoStep;
     m_scripts.clear();
     m_blackboxedPositions.clear();
     m_breakpointIdToDebuggerBreakpointIds.clear();
     allAsyncTasksCanceled();
 }
 
 } // namespace blink