Revert of DevTools: extract V8DebuggerAgent interface, move it under .../inspector/v8

third_party/WebKit/Source/core/inspector/V8DebuggerAgent.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 "config.h"
+#include "core/inspector/V8DebuggerAgent.h"
+
+#include "bindings/core/v8/ScriptCallStackFactory.h"
+#include "bindings/core/v8/ScriptRegexp.h"
+#include "bindings/core/v8/ScriptValue.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8RecursionScope.h"
+#include "bindings/core/v8/V8ScriptRunner.h"
+#include "core/dom/Microtask.h"
+#include "core/inspector/AsyncCallChain.h"
+#include "core/inspector/ContentSearchUtils.h"
+#include "core/inspector/InjectedScript.h"
+#include "core/inspector/InjectedScriptManager.h"
+#include "core/inspector/InspectorState.h"
+#include "core/inspector/InstrumentingAgents.h"
+#include "core/inspector/JSONParser.h"
+#include "core/inspector/RemoteObjectId.h"
+#include "core/inspector/ScriptAsyncCallStack.h"
+#include "core/inspector/ScriptCallFrame.h"
+#include "core/inspector/ScriptCallStack.h"
+#include "core/inspector/V8AsyncCallTracker.h"
+#include "core/inspector/v8/JavaScriptCallFrame.h"
+#include "core/inspector/v8/V8Debugger.h"
+#include "core/inspector/v8/V8JavaScriptCallFrame.h"
+#include "platform/JSONValues.h"
+#include "wtf/text/StringBuilder.h"
+#include "wtf/text/WTFString.h"
+
+using blink::TypeBuilder::Array;
+using blink::TypeBuilder::Console::AsyncStackTrace;
+using blink::TypeBuilder::Debugger::AsyncOperation;
+using blink::TypeBuilder::Debugger::BreakpointId;
+using blink::TypeBuilder::Debugger::CallFrame;
+using blink::TypeBuilder::Debugger::CollectionEntry;
+using blink::TypeBuilder::Debugger::ExceptionDetails;
+using blink::TypeBuilder::Debugger::FunctionDetails;
+using blink::TypeBuilder::Debugger::GeneratorObjectDetails;
+using blink::TypeBuilder::Debugger::PromiseDetails;
+using blink::TypeBuilder::Debugger::ScriptId;
+using blink::TypeBuilder::Debugger::StackTrace;
+using blink::TypeBuilder::Runtime::RemoteObject;
+
+namespace blink {
+
+namespace DebuggerAgentState {
+static const char debuggerEnabled[] = "debuggerEnabled";
+static const char javaScriptBreakpoints[] = "javaScriptBreakopints";
+static const char pauseOnExceptionsState[] = "pauseOnExceptionsState";
+static const char asyncCallStackDepth[] = "asyncCallStackDepth";
+static const char promiseTrackerEnabled[] = "promiseTrackerEnabled";
+static const char promiseTrackerCaptureStacks[] = "promiseTrackerCaptureStacks";
+
+// Breakpoint properties.
+static const char url[] = "url";
+static const char isRegex[] = "isRegex";
+static const char lineNumber[] = "lineNumber";
+static const char columnNumber[] = "columnNumber";
+static const char condition[] = "condition";
+static const char skipStackPattern[] = "skipStackPattern";
+static const char skipContentScripts[] = "skipContentScripts";
+static const char skipAllPauses[] = "skipAllPauses";
+
+};
+
+static const int maxSkipStepFrameCount = 128;
+
+const char V8DebuggerAgent::backtraceObjectGroup[] = "backtrace";
+
+const int V8DebuggerAgent::unknownAsyncOperationId = 0;
+
+static String breakpointIdSuffix(V8DebuggerAgent::BreakpointSource source)
+{
+    switch (source) {
+    case V8DebuggerAgent::UserBreakpointSource:
+        break;
+    case V8DebuggerAgent::DebugCommandBreakpointSource:
+        return ":debug";
+    case V8DebuggerAgent::MonitorCommandBreakpointSource:
+        return ":monitor";
+    }
+    return String();
+}
+
+static String generateBreakpointId(const String& scriptId, int lineNumber, int columnNumber, V8DebuggerAgent::BreakpointSource source)
+{
+    return scriptId + ':' + String::number(lineNumber) + ':' + String::number(columnNumber) + breakpointIdSuffix(source);
+}
+
+static ScriptCallFrame toScriptCallFrame(JavaScriptCallFrame* callFrame)
+{
+    String scriptId = String::number(callFrame->sourceID());
+    // FIXME(WK62725): Debugger line/column are 0-based, while console ones are 1-based.
+    int line = callFrame->line() + 1;
+    int column = callFrame->column() + 1;
+    return ScriptCallFrame(callFrame->functionName(), scriptId, callFrame->scriptName(), line, column);
+}
+
+static PassRefPtrWillBeRawPtr<ScriptCallStack> toScriptCallStack(JavaScriptCallFrame* callFrame)
+{
+    Vector<ScriptCallFrame> frames;
+    for (; callFrame; callFrame = callFrame->caller())
+        frames.append(toScriptCallFrame(callFrame));
+    return ScriptCallStack::create(frames);
+}
+
+static PassRefPtr<JavaScriptCallFrame> toJavaScriptCallFrame(v8::Local<v8::Object> value)
+{
+    if (value.IsEmpty())
+        return nullptr;
+    return V8JavaScriptCallFrame::unwrap(value);
+}
+
+static PassRefPtrWillBeRawPtr<ScriptCallStack> toScriptCallStack(v8::Local<v8::Object> callFrames)
+{
+    RefPtr<JavaScriptCallFrame> jsCallFrame = toJavaScriptCallFrame(callFrames);
+    return jsCallFrame ? toScriptCallStack(jsCallFrame.get()) : nullptr;
+}
+
+V8DebuggerAgent::V8DebuggerAgent(InjectedScriptManager* injectedScriptManager, V8Debugger* debugger, V8DebuggerAgent::Client* client, int contextGroupId)
+    : m_injectedScriptManager(injectedScriptManager)
+    , m_debugger(debugger)
+    , m_client(client)
+    , m_contextGroupId(contextGroupId)
+    , m_state(nullptr)
+    , m_frontend(nullptr)
+    , m_isolate(debugger->isolate())
+    , m_pausedScriptState(nullptr)
+    , m_breakReason(InspectorFrontend::Debugger::Reason::Other)
+    , m_scheduledDebuggerStep(NoStep)
+    , m_skipNextDebuggerStepOut(false)
+    , m_javaScriptPauseScheduled(false)
+    , m_steppingFromFramework(false)
+    , m_pausingOnNativeEvent(false)
+    , m_pausingOnAsyncOperation(false)
+    , m_skippedStepFrameCount(0)
+    , m_recursionLevelForStepOut(0)
+    , m_recursionLevelForStepFrame(0)
+    , m_skipAllPauses(false)
+    , m_skipContentScripts(false)
+    , m_cachedSkipStackGeneration(0)
+    , m_lastAsyncOperationId(0)
+    , m_maxAsyncCallStackDepth(0)
+    , m_currentAsyncCallChain(nullptr)
+    , m_nestedAsyncCallCount(0)
+    , m_currentAsyncOperationId(unknownAsyncOperationId)
+    , m_pendingTraceAsyncOperationCompleted(false)
+    , m_startingStepIntoAsync(false)
+    , m_compiledScripts(debugger->isolate())
+{
+    ASSERT(contextGroupId);
+    m_v8AsyncCallTracker = V8AsyncCallTracker::create(this);
+    m_promiseTracker = PromiseTracker::create(this, m_isolate);
+    clearBreakDetails();
+}
+
+V8DebuggerAgent::~V8DebuggerAgent()
+{
+}
+
+DEFINE_TRACE(V8DebuggerAgent)
+{
+#if ENABLE(OILPAN)
+    visitor->trace(m_injectedScriptManager);
+    visitor->trace(m_asyncCallTrackingListeners);
+    visitor->trace(m_v8AsyncCallTracker);
+    visitor->trace(m_promiseTracker);
+    visitor->trace(m_asyncOperations);
+    visitor->trace(m_currentAsyncCallChain);
+#endif
+}
+
+bool V8DebuggerAgent::checkEnabled(ErrorString* errorString)
+{
+    if (enabled())
+        return true;
+    *errorString = "Debugger agent is not enabled";
+    return false;
+}
+
+void V8DebuggerAgent::enable()
+{
+    // debugger().addListener may result in reporting all parsed scripts to
+    // the agent so it should already be in enabled state by then.
+    m_state->setBoolean(DebuggerAgentState::debuggerEnabled, true);
+    debugger().addListener(m_contextGroupId, this);
+    // FIXME(WK44513): breakpoints activated flag should be synchronized between all front-ends
+    debugger().setBreakpointsActivated(true);
+    m_client->debuggerAgentEnabled();
+}
+
+bool V8DebuggerAgent::enabled()
+{
+    return m_state->getBoolean(DebuggerAgentState::debuggerEnabled);
+}
+
+void V8DebuggerAgent::enable(ErrorString*)
+{
+    if (enabled())
+        return;
+
+    enable();
+
+    ASSERT(m_frontend);
+}
+
+void V8DebuggerAgent::disable(ErrorString*)
+{
+    if (!enabled())
+        return;
+
+    m_state->setObject(DebuggerAgentState::javaScriptBreakpoints, JSONObject::create());
+    m_state->setLong(DebuggerAgentState::pauseOnExceptionsState, V8Debugger::DontPauseOnExceptions);
+    m_state->setString(DebuggerAgentState::skipStackPattern, "");
+    m_state->setBoolean(DebuggerAgentState::skipContentScripts, false);
+    m_state->setLong(DebuggerAgentState::asyncCallStackDepth, 0);
+    m_state->setBoolean(DebuggerAgentState::promiseTrackerEnabled, false);
+    m_state->setBoolean(DebuggerAgentState::promiseTrackerCaptureStacks, false);
+
+    debugger().removeListener(m_contextGroupId);
+    m_client->debuggerAgentDisabled();
+    m_pausedScriptState = nullptr;
+    m_currentCallStack.Reset();
+    m_scripts.clear();
+    m_breakpointIdToDebuggerBreakpointIds.clear();
+    internalSetAsyncCallStackDepth(0);
+    m_promiseTracker->setEnabled(false, false);
+    m_continueToLocationBreakpointId = String();
+    clearBreakDetails();
+    m_scheduledDebuggerStep = NoStep;
+    m_skipNextDebuggerStepOut = false;
+    m_javaScriptPauseScheduled = false;
+    m_steppingFromFramework = false;
+    m_pausingOnNativeEvent = false;
+    m_skippedStepFrameCount = 0;
+    m_recursionLevelForStepFrame = 0;
+    m_asyncOperationNotifications.clear();
+    m_compiledScripts.Clear();
+    clearStepIntoAsync();
+    m_skipAllPauses = false;
+    m_state->setBoolean(DebuggerAgentState::debuggerEnabled, false);
+}
+
+static PassOwnPtr<ScriptRegexp> compileSkipCallFramePattern(String patternText)
+{
+    if (patternText.isEmpty())
+        return nullptr;
+    OwnPtr<ScriptRegexp> result = adoptPtr(new ScriptRegexp(patternText, TextCaseSensitive));
+    if (!result->isValid())
+        result.clear();
+    return result.release();
+}
+
+void V8DebuggerAgent::increaseCachedSkipStackGeneration()
+{
+    ++m_cachedSkipStackGeneration;
+    if (!m_cachedSkipStackGeneration)
+        m_cachedSkipStackGeneration = 1;
+}
+
+void V8DebuggerAgent::internalSetAsyncCallStackDepth(int depth)
+{
+    if (depth <= 0) {
+        m_maxAsyncCallStackDepth = 0;
+        resetAsyncCallTracker();
+    } else {
+        m_maxAsyncCallStackDepth = depth;
+    }
+    for (auto& listener: m_asyncCallTrackingListeners)
+        listener->asyncCallTrackingStateChanged(m_maxAsyncCallStackDepth);
+}
+
+void V8DebuggerAgent::clearFrontend()
+{
+    ErrorString error;
+    disable(&error);
+    ASSERT(m_frontend);
+    m_frontend = nullptr;
+}
+
+void V8DebuggerAgent::restore()
+{
+    if (enabled()) {
+        m_frontend->globalObjectCleared();
+        enable();
+        long pauseState = m_state->getLong(DebuggerAgentState::pauseOnExceptionsState, V8Debugger::DontPauseOnExceptions);
+        String error;
+        setPauseOnExceptionsImpl(&error, pauseState);
+        m_cachedSkipStackRegExp = compileSkipCallFramePattern(m_state->getString(DebuggerAgentState::skipStackPattern));
+        increaseCachedSkipStackGeneration();
+        m_skipContentScripts = m_state->getBoolean(DebuggerAgentState::skipContentScripts);
+        m_skipAllPauses = m_state->getBoolean(DebuggerAgentState::skipAllPauses);
+        internalSetAsyncCallStackDepth(m_state->getLong(DebuggerAgentState::asyncCallStackDepth));
+        m_promiseTracker->setEnabled(m_state->getBoolean(DebuggerAgentState::promiseTrackerEnabled), m_state->getBoolean(DebuggerAgentState::promiseTrackerCaptureStacks));
+    }
+}
+
+void V8DebuggerAgent::setBreakpointsActive(ErrorString* errorString, bool active)
+{
+    if (!checkEnabled(errorString))
+        return;
+    debugger().setBreakpointsActivated(active);
+}
+
+void V8DebuggerAgent::setSkipAllPauses(ErrorString*, bool skipped)
+{
+    m_skipAllPauses = skipped;
+    m_state->setBoolean(DebuggerAgentState::skipAllPauses, m_skipAllPauses);
+}
+
+bool V8DebuggerAgent::isPaused()
+{
+    return debugger().isPaused();
+}
+
+static PassRefPtr<JSONObject> buildObjectForBreakpointCookie(const String& url, int lineNumber, int columnNumber, const String& condition, bool isRegex)
+{
+    RefPtr<JSONObject> breakpointObject = JSONObject::create();
+    breakpointObject->setString(DebuggerAgentState::url, url);
+    breakpointObject->setNumber(DebuggerAgentState::lineNumber, lineNumber);
+    breakpointObject->setNumber(DebuggerAgentState::columnNumber, columnNumber);
+    breakpointObject->setString(DebuggerAgentState::condition, condition);
+    breakpointObject->setBoolean(DebuggerAgentState::isRegex, isRegex);
+    return breakpointObject.release();
+}
+
+static bool matches(const String& url, const String& pattern, bool isRegex)
+{
+    if (isRegex) {
+        ScriptRegexp regex(pattern, TextCaseSensitive);
+        return regex.match(url) != -1;
+    }
+    return url == pattern;
+}
+
+void V8DebuggerAgent::setBreakpointByUrl(ErrorString* errorString, int lineNumber, const String* const optionalURL, const String* const optionalURLRegex, const int* const optionalColumnNumber, const String* const optionalCondition, BreakpointId* outBreakpointId, RefPtr<Array<TypeBuilder::Debugger::Location>>& locations)
+{
+    locations = Array<TypeBuilder::Debugger::Location>::create();
+    if (!optionalURL == !optionalURLRegex) {
+        *errorString = "Either url or urlRegex must be specified.";
+        return;
+    }
+
+    String url = optionalURL ? *optionalURL : *optionalURLRegex;
+    int columnNumber = 0;
+    if (optionalColumnNumber) {
+        columnNumber = *optionalColumnNumber;
+        if (columnNumber < 0) {
+            *errorString = "Incorrect column number";
+            return;
+        }
+    }
+    String condition = optionalCondition ? *optionalCondition : "";
+    bool isRegex = optionalURLRegex;
+
+    String breakpointId = (isRegex ? "/" + url + "/" : url) + ':' + String::number(lineNumber) + ':' + String::number(columnNumber);
+    RefPtr<JSONObject> breakpointsCookie = m_state->getObject(DebuggerAgentState::javaScriptBreakpoints);
+    if (breakpointsCookie->find(breakpointId) != breakpointsCookie->end()) {
+        *errorString = "Breakpoint at specified location already exists.";
+        return;
+    }
+
+    breakpointsCookie->setObject(breakpointId, buildObjectForBreakpointCookie(url, lineNumber, columnNumber, condition, isRegex));
+    m_state->setObject(DebuggerAgentState::javaScriptBreakpoints, breakpointsCookie);
+
+    ScriptBreakpoint breakpoint(lineNumber, columnNumber, condition);
+    for (auto& script : m_scripts) {
+        if (!matches(script.value.sourceURL(), url, isRegex))
+            continue;
+        RefPtr<TypeBuilder::Debugger::Location> location = resolveBreakpoint(breakpointId, script.key, breakpoint, UserBreakpointSource);
+        if (location)
+            locations->addItem(location);
+    }
+
+    *outBreakpointId = breakpointId;
+}
+
+static bool parseLocation(ErrorString* errorString, PassRefPtr<JSONObject> location, String* scriptId, int* lineNumber, int* columnNumber)
+{
+    if (!location->getString("scriptId", scriptId) || !location->getNumber("lineNumber", lineNumber)) {
+        // FIXME: replace with input validation.
+        *errorString = "scriptId and lineNumber are required.";
+        return false;
+    }
+    *columnNumber = 0;
+    location->getNumber("columnNumber", columnNumber);
+    return true;
+}
+
+void V8DebuggerAgent::setBreakpoint(ErrorString* errorString, const RefPtr<JSONObject>& location, const String* const optionalCondition, BreakpointId* outBreakpointId, RefPtr<TypeBuilder::Debugger::Location>& actualLocation)
+{
+    String scriptId;
+    int lineNumber;
+    int columnNumber;
+
+    if (!parseLocation(errorString, location, &scriptId, &lineNumber, &columnNumber))
+        return;
+
+    String condition = optionalCondition ? *optionalCondition : emptyString();
+
+    String breakpointId = generateBreakpointId(scriptId, lineNumber, columnNumber, UserBreakpointSource);
+    if (m_breakpointIdToDebuggerBreakpointIds.find(breakpointId) != m_breakpointIdToDebuggerBreakpointIds.end()) {
+        *errorString = "Breakpoint at specified location already exists.";
+        return;
+    }
+    ScriptBreakpoint breakpoint(lineNumber, columnNumber, condition);
+    actualLocation = resolveBreakpoint(breakpointId, scriptId, breakpoint, UserBreakpointSource);
+    if (actualLocation)
+        *outBreakpointId = breakpointId;
+    else
+        *errorString = "Could not resolve breakpoint";
+}
+
+void V8DebuggerAgent::removeBreakpoint(ErrorString* errorString, const String& breakpointId)
+{
+    if (!checkEnabled(errorString))
+        return;
+    RefPtr<JSONObject> breakpointsCookie = m_state->getObject(DebuggerAgentState::javaScriptBreakpoints);
+    breakpointsCookie->remove(breakpointId);
+    m_state->setObject(DebuggerAgentState::javaScriptBreakpoints, breakpointsCookie);
+    removeBreakpoint(breakpointId);
+}
+
+void V8DebuggerAgent::removeBreakpoint(const String& breakpointId)
+{
+    ASSERT(enabled());
+    BreakpointIdToDebuggerBreakpointIdsMap::iterator debuggerBreakpointIdsIterator = m_breakpointIdToDebuggerBreakpointIds.find(breakpointId);
+    if (debuggerBreakpointIdsIterator == m_breakpointIdToDebuggerBreakpointIds.end())
+        return;
+    for (size_t i = 0; i < debuggerBreakpointIdsIterator->value.size(); ++i) {
+        const String& debuggerBreakpointId = debuggerBreakpointIdsIterator->value[i];
+        debugger().removeBreakpoint(debuggerBreakpointId);
+        m_serverBreakpoints.remove(debuggerBreakpointId);
+    }
+    m_breakpointIdToDebuggerBreakpointIds.remove(debuggerBreakpointIdsIterator);
+}
+
+void V8DebuggerAgent::continueToLocation(ErrorString* errorString, const RefPtr<JSONObject>& location, const bool* interstateLocationOpt)
+{
+    if (!checkEnabled(errorString))
+        return;
+    if (!m_continueToLocationBreakpointId.isEmpty()) {
+        debugger().removeBreakpoint(m_continueToLocationBreakpointId);
+        m_continueToLocationBreakpointId = "";
+    }
+
+    String scriptId;
+    int lineNumber;
+    int columnNumber;
+
+    if (!parseLocation(errorString, location, &scriptId, &lineNumber, &columnNumber))
+        return;
+
+    ScriptBreakpoint breakpoint(lineNumber, columnNumber, "");
+    m_continueToLocationBreakpointId = debugger().setBreakpoint(scriptId, breakpoint, &lineNumber, &columnNumber, asBool(interstateLocationOpt));
+    resume(errorString);
+}
+
+void V8DebuggerAgent::getStepInPositions(ErrorString* errorString, const String& callFrameId, RefPtr<Array<TypeBuilder::Debugger::Location>>& positions)
+{
+    if (!isPaused() || m_currentCallStack.IsEmpty()) {
+        *errorString = "Attempt to access callframe when debugger is not on pause";
+        return;
+    }
+    OwnPtr<RemoteCallFrameId> remoteId = RemoteCallFrameId::parse(callFrameId);
+    if (!remoteId) {
+        *errorString = "Invalid call frame id";
+        return;
+    }
+    InjectedScript injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+    if (injectedScript.isEmpty()) {
+        *errorString = "Inspected frame has gone";
+        return;
+    }
+
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Object> callStack = m_currentCallStack.Get(m_isolate);
+    injectedScript.getStepInPositions(errorString, callStack, callFrameId, positions);
+}
+
+void V8DebuggerAgent::getBacktrace(ErrorString* errorString, RefPtr<Array<CallFrame>>& callFrames, RefPtr<StackTrace>& asyncStackTrace)
+{
+    if (!assertPaused(errorString))
+        return;
+    m_currentCallStack.Reset(m_isolate, debugger().currentCallFrames());
+    callFrames = currentCallFrames();
+    asyncStackTrace = currentAsyncStackTrace();
+}
+
+bool V8DebuggerAgent::isCallStackEmptyOrBlackboxed()
+{
+    ASSERT(enabled());
+    for (int index = 0; ; ++index) {
+        RefPtr<JavaScriptCallFrame> frame = debugger().callFrameNoScopes(index);
+        if (!frame)
+            break;
+        if (!isCallFrameWithUnknownScriptOrBlackboxed(frame.release()))
+            return false;
+    }
+    return true;
+}
+
+bool V8DebuggerAgent::isTopCallFrameBlackboxed()
+{
+    ASSERT(enabled());
+    return isCallFrameWithUnknownScriptOrBlackboxed(debugger().callFrameNoScopes(0));
+}
+
+bool V8DebuggerAgent::isCallFrameWithUnknownScriptOrBlackboxed(PassRefPtr<JavaScriptCallFrame> pFrame)
+{
+    RefPtr<JavaScriptCallFrame> frame = pFrame;
+    if (!frame)
+        return true;
+    ScriptsMap::iterator it = m_scripts.find(String::number(frame->sourceID()));
+    if (it == m_scripts.end()) {
+        // Unknown scripts are blackboxed.
+        return true;
+    }
+    if (m_skipContentScripts && it->value.isContentScript())
+        return true;
+    bool isBlackboxed = false;
+    String scriptURL = it->value.sourceURL();
+    if (m_cachedSkipStackRegExp && !scriptURL.isEmpty()) {
+        if (!it->value.getBlackboxedState(m_cachedSkipStackGeneration, &isBlackboxed)) {
+            isBlackboxed = m_cachedSkipStackRegExp->match(scriptURL) != -1;
+            it->value.setBlackboxedState(m_cachedSkipStackGeneration, isBlackboxed);
+        }
+    }
+    return isBlackboxed;
+}
+
+V8DebuggerListener::SkipPauseRequest V8DebuggerAgent::shouldSkipExceptionPause()
+{
+    if (m_steppingFromFramework)
+        return V8DebuggerListener::NoSkip;
+    if (isTopCallFrameBlackboxed())
+        return V8DebuggerListener::Continue;
+    return V8DebuggerListener::NoSkip;
+}
+
+V8DebuggerListener::SkipPauseRequest V8DebuggerAgent::shouldSkipStepPause()
+{
+    if (m_steppingFromFramework)
+        return V8DebuggerListener::NoSkip;
+
+    if (m_skipNextDebuggerStepOut) {
+        m_skipNextDebuggerStepOut = false;
+        if (m_scheduledDebuggerStep == StepOut)
+            return V8DebuggerListener::StepOut;
+    }
+
+    if (!isTopCallFrameBlackboxed())
+        return V8DebuggerListener::NoSkip;
+
+    if (m_skippedStepFrameCount >= maxSkipStepFrameCount)
+        return V8DebuggerListener::StepOut;
+
+    if (!m_skippedStepFrameCount)
+        m_recursionLevelForStepFrame = 1;
+
+    ++m_skippedStepFrameCount;
+    return V8DebuggerListener::StepFrame;
+}
+
+PassRefPtr<TypeBuilder::Debugger::Location> V8DebuggerAgent::resolveBreakpoint(const String& breakpointId, const String& scriptId, const ScriptBreakpoint& breakpoint, BreakpointSource source)
+{
+    ASSERT(enabled());
+    // FIXME: remove these checks once crbug.com/520702 is resolved.
+    RELEASE_ASSERT(!breakpointId.isEmpty());
+    RELEASE_ASSERT(!scriptId.isEmpty());
+    ScriptsMap::iterator scriptIterator = m_scripts.find(scriptId);
+    if (scriptIterator == m_scripts.end())
+        return nullptr;
+    Script& script = scriptIterator->value;
+    if (breakpoint.lineNumber < script.startLine() || script.endLine() < breakpoint.lineNumber)
+        return nullptr;
+
+    int actualLineNumber;
+    int actualColumnNumber;
+    String debuggerBreakpointId = debugger().setBreakpoint(scriptId, breakpoint, &actualLineNumber, &actualColumnNumber, false);
+    if (debuggerBreakpointId.isEmpty())
+        return nullptr;
+
+    m_serverBreakpoints.set(debuggerBreakpointId, std::make_pair(breakpointId, source));
+
+    RELEASE_ASSERT(!breakpointId.isEmpty());
+    BreakpointIdToDebuggerBreakpointIdsMap::iterator debuggerBreakpointIdsIterator = m_breakpointIdToDebuggerBreakpointIds.find(breakpointId);
+    if (debuggerBreakpointIdsIterator == m_breakpointIdToDebuggerBreakpointIds.end())
+        m_breakpointIdToDebuggerBreakpointIds.set(breakpointId, Vector<String>()).storedValue->value.append(debuggerBreakpointId);
+    else
+        debuggerBreakpointIdsIterator->value.append(debuggerBreakpointId);
+
+    RefPtr<TypeBuilder::Debugger::Location> location = TypeBuilder::Debugger::Location::create()
+        .setScriptId(scriptId)
+        .setLineNumber(actualLineNumber);
+    location->setColumnNumber(actualColumnNumber);
+    return location;
+}
+
+void V8DebuggerAgent::searchInContent(ErrorString* error, const String& scriptId, const String& query, const bool* const optionalCaseSensitive, const bool* const optionalIsRegex, RefPtr<Array<TypeBuilder::Debugger::SearchMatch>>& results)
+{
+    ScriptsMap::iterator it = m_scripts.find(scriptId);
+    if (it != m_scripts.end())
+        results = ContentSearchUtils::searchInTextByLines(it->value.source(), query, asBool(optionalCaseSensitive), asBool(optionalIsRegex));
+    else
+        *error = "No script for id: " + scriptId;
+}
+
+void V8DebuggerAgent::setScriptSource(ErrorString* error, RefPtr<TypeBuilder::Debugger::SetScriptSourceError>& errorData, const String& scriptId, const String& newContent, const bool* const preview, RefPtr<Array<CallFrame>>& newCallFrames, TypeBuilder::OptOutput<bool>* stackChanged, RefPtr<StackTrace>& asyncStackTrace)
+{
+    if (!checkEnabled(error))
+        return;
+    if (!debugger().setScriptSource(scriptId, newContent, asBool(preview), error, errorData, &m_currentCallStack, stackChanged))
+        return;
+
+    newCallFrames = currentCallFrames();
+    asyncStackTrace = currentAsyncStackTrace();
+
+    ScriptsMap::iterator it = m_scripts.find(scriptId);
+    if (it == m_scripts.end())
+        return;
+    it->value.setSource(newContent);
+}
+
+void V8DebuggerAgent::restartFrame(ErrorString* errorString, const String& callFrameId, RefPtr<Array<CallFrame>>& newCallFrames, RefPtr<StackTrace>& asyncStackTrace)
+{
+    if (!isPaused() || m_currentCallStack.IsEmpty()) {
+        *errorString = "Attempt to access callframe when debugger is not on pause";
+        return;
+    }
+    OwnPtr<RemoteCallFrameId> remoteId = RemoteCallFrameId::parse(callFrameId);
+    if (!remoteId) {
+        *errorString = "Invalid call frame id";
+        return;
+    }
+    InjectedScript injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+    if (injectedScript.isEmpty()) {
+        *errorString = "Inspected frame has gone";
+        return;
+    }
+
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Object> callStack = m_currentCallStack.Get(m_isolate);
+    injectedScript.restartFrame(errorString, callStack, callFrameId);
+    m_currentCallStack.Reset(m_isolate, debugger().currentCallFrames());
+    newCallFrames = currentCallFrames();
+    asyncStackTrace = currentAsyncStackTrace();
+}
+
+void V8DebuggerAgent::getScriptSource(ErrorString* error, const String& scriptId, String* scriptSource)
+{
+    if (!checkEnabled(error))
+        return;
+    ScriptsMap::iterator it = m_scripts.find(scriptId);
+    if (it == m_scripts.end()) {
+        *error = "No script for id: " + scriptId;
+        return;
+    }
+    *scriptSource = it->value.source();
+}
+
+void V8DebuggerAgent::getFunctionDetails(ErrorString* errorString, const String& functionId, RefPtr<FunctionDetails>& details)
+{
+    if (!checkEnabled(errorString))
+        return;
+    OwnPtr<RemoteObjectId> remoteId = RemoteObjectId::parse(functionId);
+    if (!remoteId) {
+        *errorString = "Invalid object id";
+        return;
+    }
+    InjectedScript injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+    if (injectedScript.isEmpty()) {
+        *errorString = "Function object id is obsolete";
+        return;
+    }
+    injectedScript.getFunctionDetails(errorString, functionId, &details);
+}
+
+void V8DebuggerAgent::getGeneratorObjectDetails(ErrorString* errorString, const String& objectId, RefPtr<GeneratorObjectDetails>& details)
+{
+    if (!checkEnabled(errorString))
+        return;
+    OwnPtr<RemoteObjectId> remoteId = RemoteObjectId::parse(objectId);
+    if (!remoteId) {
+        *errorString = "Invalid object id";
+        return;
+    }
+    InjectedScript injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+    if (injectedScript.isEmpty()) {
+        *errorString = "Inspected frame has gone";
+        return;
+    }
+    injectedScript.getGeneratorObjectDetails(errorString, objectId, &details);
+}
+
+void V8DebuggerAgent::getCollectionEntries(ErrorString* errorString, const String& objectId, RefPtr<TypeBuilder::Array<CollectionEntry>>& entries)
+{
+    if (!checkEnabled(errorString))
+        return;
+    OwnPtr<RemoteObjectId> remoteId = RemoteObjectId::parse(objectId);
+    if (!remoteId) {
+        *errorString = "Invalid object id";
+        return;
+    }
+    InjectedScript injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+    if (injectedScript.isEmpty()) {
+        *errorString = "Inspected frame has gone";
+        return;
+    }
+    injectedScript.getCollectionEntries(errorString, objectId, &entries);
+}
+
+void V8DebuggerAgent::schedulePauseOnNextStatement(InspectorFrontend::Debugger::Reason::Enum breakReason, PassRefPtr<JSONObject> data)
+{
+    ASSERT(enabled());
+    if (m_scheduledDebuggerStep == StepInto || m_javaScriptPauseScheduled || isPaused())
+        return;
+    m_breakReason = breakReason;
+    m_breakAuxData = data;
+    m_pausingOnNativeEvent = true;
+    m_skipNextDebuggerStepOut = false;
+    debugger().setPauseOnNextStatement(true);
+}
+
+void V8DebuggerAgent::schedulePauseOnNextStatementIfSteppingInto()
+{
+    ASSERT(enabled());
+    if (m_scheduledDebuggerStep != StepInto || m_javaScriptPauseScheduled || isPaused())
+        return;
+    clearBreakDetails();
+    m_pausingOnNativeEvent = false;
+    m_skippedStepFrameCount = 0;
+    m_recursionLevelForStepFrame = 0;
+    debugger().setPauseOnNextStatement(true);
+}
+
+void V8DebuggerAgent::cancelPauseOnNextStatement()
+{
+    if (m_javaScriptPauseScheduled || isPaused())
+        return;
+    clearBreakDetails();
+    m_pausingOnNativeEvent = false;
+    debugger().setPauseOnNextStatement(false);
+}
+
+bool V8DebuggerAgent::v8AsyncTaskEventsEnabled() const
+{
+    return trackingAsyncCalls();
+}
+
+void V8DebuggerAgent::didReceiveV8AsyncTaskEvent(v8::Local<v8::Context> context, const String& eventType, const String& eventName, int id)
+{
+    ASSERT(trackingAsyncCalls());
+    ScriptState* state = ScriptState::from(context);
+    m_v8AsyncCallTracker->didReceiveV8AsyncTaskEvent(state, eventType, eventName, id);
+}
+
+bool V8DebuggerAgent::v8PromiseEventsEnabled() const
+{
+    return m_promiseTracker->isEnabled();
+}
+
+void V8DebuggerAgent::didReceiveV8PromiseEvent(v8::Local<v8::Context> context, v8::Local<v8::Object> promise, v8::Local<v8::Value> parentPromise, int status)
+{
+    ASSERT(m_promiseTracker->isEnabled());
+    ScriptState* scriptState = ScriptState::from(context);
+    m_promiseTracker->didReceiveV8PromiseEvent(scriptState, promise, parentPromise, status);
+}
+
+void V8DebuggerAgent::pause(ErrorString* errorString)
+{
+    if (!checkEnabled(errorString))
+        return;
+    if (m_javaScriptPauseScheduled || isPaused())
+        return;
+    clearBreakDetails();
+    clearStepIntoAsync();
+    m_javaScriptPauseScheduled = true;
+    m_scheduledDebuggerStep = NoStep;
+    m_skippedStepFrameCount = 0;
+    m_steppingFromFramework = false;
+    debugger().setPauseOnNextStatement(true);
+}
+
+void V8DebuggerAgent::resume(ErrorString* errorString)
+{
+    if (!assertPaused(errorString))
+        return;
+    m_scheduledDebuggerStep = NoStep;
+    m_steppingFromFramework = false;
+    m_injectedScriptManager->releaseObjectGroup(V8DebuggerAgent::backtraceObjectGroup);
+    debugger().continueProgram();
+}
+
+void V8DebuggerAgent::stepOver(ErrorString* errorString)
+{
+    if (!assertPaused(errorString))
+        return;
+    // StepOver at function return point should fallback to StepInto.
+    RefPtr<JavaScriptCallFrame> frame = debugger().callFrameNoScopes(0);
+    if (frame && frame->isAtReturn()) {
+        stepInto(errorString);
+        return;
+    }
+    m_scheduledDebuggerStep = StepOver;
+    m_steppingFromFramework = isTopCallFrameBlackboxed();
+    m_injectedScriptManager->releaseObjectGroup(V8DebuggerAgent::backtraceObjectGroup);
+    debugger().stepOverStatement();
+}
+
+void V8DebuggerAgent::stepInto(ErrorString* errorString)
+{
+    if (!assertPaused(errorString))
+        return;
+    m_scheduledDebuggerStep = StepInto;
+    m_steppingFromFramework = isTopCallFrameBlackboxed();
+    m_injectedScriptManager->releaseObjectGroup(V8DebuggerAgent::backtraceObjectGroup);
+    debugger().stepIntoStatement();
+}
+
+void V8DebuggerAgent::stepOut(ErrorString* errorString)
+{
+    if (!assertPaused(errorString))
+        return;
+    m_scheduledDebuggerStep = StepOut;
+    m_skipNextDebuggerStepOut = false;
+    m_recursionLevelForStepOut = 1;
+    m_steppingFromFramework = isTopCallFrameBlackboxed();
+    m_injectedScriptManager->releaseObjectGroup(V8DebuggerAgent::backtraceObjectGroup);
+    debugger().stepOutOfFunction();
+}
+
+void V8DebuggerAgent::stepIntoAsync(ErrorString* errorString)
+{
+    if (!assertPaused(errorString))
+        return;
+    if (!trackingAsyncCalls()) {
+        *errorString = "Can only perform operation if async call stacks are enabled.";
+        return;
+    }
+    clearStepIntoAsync();
+    m_startingStepIntoAsync = true;
+    stepInto(errorString);
+}
+
+void V8DebuggerAgent::setPauseOnExceptions(ErrorString* errorString, const String& stringPauseState)
+{
+    if (!checkEnabled(errorString))
+        return;
+    V8Debugger::PauseOnExceptionsState pauseState;
+    if (stringPauseState == "none") {
+        pauseState = V8Debugger::DontPauseOnExceptions;
+    } else if (stringPauseState == "all") {
+        pauseState = V8Debugger::PauseOnAllExceptions;
+    } else if (stringPauseState == "uncaught") {
+        pauseState = V8Debugger::PauseOnUncaughtExceptions;
+    } else {
+        *errorString = "Unknown pause on exceptions mode: " + stringPauseState;
+        return;
+    }
+    setPauseOnExceptionsImpl(errorString, pauseState);
+}
+
+void V8DebuggerAgent::setPauseOnExceptionsImpl(ErrorString* errorString, int pauseState)
+{
+    debugger().setPauseOnExceptionsState(static_cast<V8Debugger::PauseOnExceptionsState>(pauseState));
+    if (debugger().pauseOnExceptionsState() != pauseState)
+        *errorString = "Internal error. Could not change pause on exceptions state";
+    else
+        m_state->setLong(DebuggerAgentState::pauseOnExceptionsState, pauseState);
+}
+
+bool V8DebuggerAgent::callStackForId(ErrorString* errorString, const RemoteCallFrameId& callFrameId, v8::Local<v8::Object>* callStack, bool* isAsync)
+{
+    unsigned asyncOrdinal = callFrameId.asyncStackOrdinal(); // 0 is current call stack
+    if (!asyncOrdinal) {
+        *callStack = m_currentCallStack.Get(m_isolate);
+        *isAsync = false;
+        return true;
+    }
+    if (!m_currentAsyncCallChain || asyncOrdinal < 1 || asyncOrdinal >= m_currentAsyncCallChain->callStacks().size()) {
+        *errorString = "Async call stack not found";
+        return false;
+    }
+    RefPtrWillBeRawPtr<AsyncCallStack> asyncStack = m_currentAsyncCallChain->callStacks()[asyncOrdinal - 1];
+    *callStack = asyncStack->callFrames(m_isolate);
+    *isAsync = true;
+    return true;
+}
+
+void V8DebuggerAgent::evaluateOnCallFrame(ErrorString* errorString, const String& callFrameId, const String& expression, const String* const objectGroup, const bool* const includeCommandLineAPI, const bool* const doNotPauseOnExceptionsAndMuteConsole, const bool* const returnByValue, const bool* generatePreview, RefPtr<RemoteObject>& result, TypeBuilder::OptOutput<bool>* wasThrown, RefPtr<TypeBuilder::Debugger::ExceptionDetails>& exceptionDetails)
+{
+    if (!isPaused() || m_currentCallStack.IsEmpty()) {
+        *errorString = "Attempt to access callframe when debugger is not on pause";
+        return;
+    }
+    OwnPtr<RemoteCallFrameId> remoteId = RemoteCallFrameId::parse(callFrameId);
+    if (!remoteId) {
+        *errorString = "Invalid call frame id";
+        return;
+    }
+    InjectedScript injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+    if (injectedScript.isEmpty()) {
+        *errorString = "Inspected frame has gone";
+        return;
+    }
+
+    v8::HandleScope scope(m_isolate);
+    bool isAsync = false;
+    v8::Local<v8::Object> callStack;
+    if (!callStackForId(errorString, *remoteId, &callStack, &isAsync))
+        return;
+    ASSERT(!callStack.IsEmpty());
+
+    V8Debugger::PauseOnExceptionsState previousPauseOnExceptionsState = debugger().pauseOnExceptionsState();
+    if (asBool(doNotPauseOnExceptionsAndMuteConsole)) {
+        if (previousPauseOnExceptionsState != V8Debugger::DontPauseOnExceptions)
+            debugger().setPauseOnExceptionsState(V8Debugger::DontPauseOnExceptions);
+        m_client->muteConsole();
+    }
+
+    injectedScript.evaluateOnCallFrame(errorString, callStack, isAsync, callFrameId, expression, objectGroup ? *objectGroup : "", asBool(includeCommandLineAPI), asBool(returnByValue), asBool(generatePreview), &result, wasThrown, &exceptionDetails);
+    if (asBool(doNotPauseOnExceptionsAndMuteConsole)) {
+        m_client->unmuteConsole();
+        if (debugger().pauseOnExceptionsState() != previousPauseOnExceptionsState)
+            debugger().setPauseOnExceptionsState(previousPauseOnExceptionsState);
+    }
+}
+
+InjectedScript V8DebuggerAgent::injectedScriptForEval(ErrorString* errorString, const int* executionContextId)
+{
+    InjectedScript injectedScript = executionContextId ? m_injectedScriptManager->injectedScriptForId(*executionContextId) : m_client->defaultInjectedScript();
+    if (injectedScript.isEmpty())
+        *errorString = "Execution context with given id not found.";
+    return injectedScript;
+}
+
+void V8DebuggerAgent::compileScript(ErrorString* errorString, const String& expression, const String& sourceURL, bool persistScript, const int* executionContextId, TypeBuilder::OptOutput<ScriptId>* scriptId, RefPtr<ExceptionDetails>& exceptionDetails)
+{
+    if (!checkEnabled(errorString))
+        return;
+    InjectedScript injectedScript = injectedScriptForEval(errorString, executionContextId);
+    if (injectedScript.isEmpty() || !injectedScript.scriptState()->contextIsValid()) {
+        *errorString = "Inspected frame has gone";
+        return;
+    }
+
+    ScriptState::Scope scope(injectedScript.scriptState());
+    v8::Local<v8::String> source = v8String(m_isolate, expression);
+    v8::TryCatch tryCatch;
+    v8::Local<v8::Script> script;
+    if (!v8Call(V8ScriptRunner::compileScript(source, sourceURL, String(), TextPosition(), m_isolate), script, tryCatch)) {
+        v8::Local<v8::Message> message = tryCatch.Message();
+        if (!message.IsEmpty())
+            exceptionDetails = createExceptionDetails(m_isolate, message);
+        else
+            *errorString = "Script compilation failed";
+        return;
+    }
+
+    if (!persistScript)
+        return;
+
+    String scriptValueId = String::number(script->GetUnboundScript()->GetId());
+    m_compiledScripts.Set(scriptValueId, script);
+    *scriptId = scriptValueId;
+}
+
+void V8DebuggerAgent::runScript(ErrorString* errorString, const ScriptId& scriptId, const int* executionContextId, const String* const objectGroup, const bool* const doNotPauseOnExceptionsAndMuteConsole, RefPtr<RemoteObject>& result, RefPtr<ExceptionDetails>& exceptionDetails)
+{
+    if (!checkEnabled(errorString))
+        return;
+    InjectedScript injectedScript = injectedScriptForEval(errorString, executionContextId);
+    if (injectedScript.isEmpty()) {
+        *errorString = "Inspected frame has gone";
+        return;
+    }
+
+    V8Debugger::PauseOnExceptionsState previousPauseOnExceptionsState = debugger().pauseOnExceptionsState();
+    if (asBool(doNotPauseOnExceptionsAndMuteConsole)) {
+        if (previousPauseOnExceptionsState != V8Debugger::DontPauseOnExceptions)
+            debugger().setPauseOnExceptionsState(V8Debugger::DontPauseOnExceptions);
+        m_client->muteConsole();
+    }
+
+    if (!m_compiledScripts.Contains(scriptId)) {
+        *errorString = "Script execution failed";
+        return;
+    }
+
+    ScriptState* scriptState = injectedScript.scriptState();
+    ScriptState::Scope scope(scriptState);
+    v8::Local<v8::Script> script = v8::Local<v8::Script>::New(m_isolate, m_compiledScripts.Remove(scriptId));
+
+    if (script.IsEmpty() || !scriptState->contextIsValid()) {
+        *errorString = "Script execution failed";
+        return;
+    }
+    v8::TryCatch tryCatch;
+    v8::Local<v8::Value> value;
+    ScriptValue scriptValue;
+    if (v8Call(V8ScriptRunner::runCompiledScript(m_isolate, script, scriptState->executionContext()), value, tryCatch)) {
+        scriptValue = ScriptValue(scriptState, value);
+    } else {
+        scriptValue = ScriptValue(scriptState, tryCatch.Exception());
+        v8::Local<v8::Message> message = tryCatch.Message();
+        if (!message.IsEmpty())
+            exceptionDetails = createExceptionDetails(m_isolate, message);
+    }
+
+    if (scriptValue.isEmpty()) {
+        *errorString = "Script execution failed";
+        return;
+    }
+
+    result = injectedScript.wrapObject(scriptValue, objectGroup ? *objectGroup : "");
+
+    if (asBool(doNotPauseOnExceptionsAndMuteConsole)) {
+        m_client->unmuteConsole();
+        if (debugger().pauseOnExceptionsState() != previousPauseOnExceptionsState)
+            debugger().setPauseOnExceptionsState(previousPauseOnExceptionsState);
+    }
+}
+
+void V8DebuggerAgent::setVariableValue(ErrorString* errorString, int scopeNumber, const String& variableName, const RefPtr<JSONObject>& newValue, const String* callFrameId, const String* functionObjectId)
+{
+    if (!checkEnabled(errorString))
+        return;
+    InjectedScript injectedScript;
+    if (callFrameId) {
+        if (!isPaused() || m_currentCallStack.IsEmpty()) {
+            *errorString = "Attempt to access callframe when debugger is not on pause";
+            return;
+        }
+        OwnPtr<RemoteCallFrameId> remoteId = RemoteCallFrameId::parse(*callFrameId);
+        if (!remoteId) {
+            *errorString = "Invalid call frame id";
+            return;
+        }
+        injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+        if (injectedScript.isEmpty()) {
+            *errorString = "Inspected frame has gone";
+            return;
+        }
+    } else if (functionObjectId) {
+        OwnPtr<RemoteObjectId> remoteId = RemoteObjectId::parse(*functionObjectId);
+        if (!remoteId) {
+            *errorString = "Invalid object id";
+            return;
+        }
+        injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
+        if (injectedScript.isEmpty()) {
+            *errorString = "Function object id cannot be resolved";
+            return;
+        }
+    } else {
+        *errorString = "Either call frame or function object must be specified";
+        return;
+    }
+    String newValueString = newValue->toJSONString();
+
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Object> currentCallStack = m_currentCallStack.Get(m_isolate);
+    injectedScript.setVariableValue(errorString, currentCallStack, callFrameId, functionObjectId, scopeNumber, variableName, newValueString);
+}
+
+void V8DebuggerAgent::skipStackFrames(ErrorString* errorString, const String* pattern, const bool* skipContentScripts)
+{
+    if (!checkEnabled(errorString))
+        return;
+    OwnPtr<ScriptRegexp> compiled;
+    String patternValue = pattern ? *pattern : "";
+    if (!patternValue.isEmpty()) {
+        compiled = compileSkipCallFramePattern(patternValue);
+        if (!compiled) {
+            *errorString = "Invalid regular expression";
+            return;
+        }
+    }
+    m_state->setString(DebuggerAgentState::skipStackPattern, patternValue);
+    m_cachedSkipStackRegExp = compiled.release();
+    increaseCachedSkipStackGeneration();
+    m_skipContentScripts = asBool(skipContentScripts);
+    m_state->setBoolean(DebuggerAgentState::skipContentScripts, m_skipContentScripts);
+}
+
+void V8DebuggerAgent::setAsyncCallStackDepth(ErrorString* errorString, int depth)
+{
+    if (!checkEnabled(errorString))
+        return;
+    m_state->setLong(DebuggerAgentState::asyncCallStackDepth, depth);
+    internalSetAsyncCallStackDepth(depth);
+}
+
+void V8DebuggerAgent::enablePromiseTracker(ErrorString* errorString, const bool* captureStacks)
+{
+    if (!checkEnabled(errorString))
+        return;
+    m_state->setBoolean(DebuggerAgentState::promiseTrackerEnabled, true);
+    m_state->setBoolean(DebuggerAgentState::promiseTrackerCaptureStacks, asBool(captureStacks));
+    m_promiseTracker->setEnabled(true, asBool(captureStacks));
+}
+
+void V8DebuggerAgent::disablePromiseTracker(ErrorString* errorString)
+{
+    if (!checkEnabled(errorString))
+        return;
+    m_state->setBoolean(DebuggerAgentState::promiseTrackerEnabled, false);
+    m_promiseTracker->setEnabled(false, false);
+}
+
+void V8DebuggerAgent::getPromiseById(ErrorString* errorString, int promiseId, const String* objectGroup, RefPtr<RemoteObject>& promise)
+{
+    if (!checkEnabled(errorString))
+        return;
+    if (!m_promiseTracker->isEnabled()) {
+        *errorString = "Promise tracking is disabled";
+        return;
+    }
+    ScriptValue value = m_promiseTracker->promiseById(promiseId);
+    if (value.isEmpty()) {
+        *errorString = "Promise with specified ID not found.";
+        return;
+    }
+    InjectedScript injectedScript = m_injectedScriptManager->injectedScriptFor(value.scriptState());
+    promise = injectedScript.wrapObject(value, objectGroup ? *objectGroup : "");
+}
+
+void V8DebuggerAgent::didUpdatePromise(InspectorFrontend::Debugger::EventType::Enum eventType, PassRefPtr<TypeBuilder::Debugger::PromiseDetails> promise)
+{
+    if (m_frontend)
+        m_frontend->promiseUpdated(eventType, promise);
+}
+
+int V8DebuggerAgent::traceAsyncOperationStarting(const String& description)
+{
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Object> callFrames = debugger().currentCallFramesForAsyncStack();
+    RefPtrWillBeRawPtr<AsyncCallChain> chain = nullptr;
+    if (callFrames.IsEmpty()) {
+        if (m_currentAsyncCallChain)
+            chain = AsyncCallChain::create(nullptr, m_currentAsyncCallChain.get(), m_maxAsyncCallStackDepth);
+    } else {
+        chain = AsyncCallChain::create(adoptRefWillBeNoop(new AsyncCallStack(description, callFrames)), m_currentAsyncCallChain.get(), m_maxAsyncCallStackDepth);
+    }
+    do {
+        ++m_lastAsyncOperationId;
+        if (m_lastAsyncOperationId <= 0)
+            m_lastAsyncOperationId = 1;
+    } while (m_asyncOperations.contains(m_lastAsyncOperationId));
+    m_asyncOperations.set(m_lastAsyncOperationId, chain);
+    if (chain)
+        m_asyncOperationNotifications.add(m_lastAsyncOperationId);
+
+    if (m_startingStepIntoAsync) {
+        // We have successfully started a StepIntoAsync, so revoke the debugger's StepInto
+        // and wait for the corresponding async operation breakpoint.
+        ASSERT(m_pausingAsyncOperations.isEmpty());
+        m_pausingAsyncOperations.add(m_lastAsyncOperationId);
+        m_startingStepIntoAsync = false;
+        m_scheduledDebuggerStep = NoStep;
+        debugger().clearStepping();
+    } else if (m_pausingOnAsyncOperation) {
+        m_pausingAsyncOperations.add(m_lastAsyncOperationId);
+    }
+
+    if (m_pausedScriptState)
+        flushAsyncOperationEvents(nullptr);
+    return m_lastAsyncOperationId;
+}
+
+void V8DebuggerAgent::traceAsyncCallbackStarting(int operationId)
+{
+    ASSERT(operationId > 0 || operationId == unknownAsyncOperationId);
+    AsyncCallChain* chain = operationId > 0 ? m_asyncOperations.get(operationId) : nullptr;
+    // FIXME: extract recursion check into a delegate.
+    int recursionLevel = V8RecursionScope::recursionLevel(m_isolate);
+    if (chain && (!recursionLevel || (recursionLevel == 1 && Microtask::performingCheckpoint(m_isolate)))) {
+        // There can be still an old m_currentAsyncCallChain set if we start running Microtasks
+        // right after executing a JS callback but before the corresponding traceAsyncCallbackCompleted().
+        // In this case just call traceAsyncCallbackCompleted() now, and the subsequent ones will be ignored.
+        //
+        // The nested levels count may be greater than 1, for example, when events are guarded via custom
+        // traceAsync* calls, like in window.postMessage(). In this case there will be a willHandleEvent
+        // instrumentation with unknownAsyncOperationId bumping up the nested levels count.
+        if (m_currentAsyncCallChain) {
+            ASSERT(m_nestedAsyncCallCount >= 1);
+            ASSERT(recursionLevel == 1 && Microtask::performingCheckpoint(m_isolate));
+            m_nestedAsyncCallCount = 1;
+            traceAsyncCallbackCompleted();
+        }
+
+        // Current AsyncCallChain corresponds to the bottommost JS call frame.
+        ASSERT(!m_currentAsyncCallChain);
+        m_currentAsyncCallChain = chain;
+        m_currentAsyncOperationId = operationId;
+        m_pendingTraceAsyncOperationCompleted = false;
+        m_nestedAsyncCallCount = 1;
+
+        if (m_pausingAsyncOperations.contains(operationId) || m_asyncOperationBreakpoints.contains(operationId)) {
+            m_pausingOnAsyncOperation = true;
+            m_scheduledDebuggerStep = StepInto;
+            m_skippedStepFrameCount = 0;
+            m_recursionLevelForStepFrame = 0;
+            debugger().setPauseOnNextStatement(true);
+        }
+    } else {
+        if (m_currentAsyncCallChain)
+            ++m_nestedAsyncCallCount;
+    }
+}
+
+void V8DebuggerAgent::traceAsyncCallbackCompleted()
+{
+    if (!m_nestedAsyncCallCount)
+        return;
+    ASSERT(m_currentAsyncCallChain);
+    --m_nestedAsyncCallCount;
+    if (!m_nestedAsyncCallCount) {
+        clearCurrentAsyncOperation();
+        if (!m_pausingOnAsyncOperation)
+            return;
+        m_pausingOnAsyncOperation = false;
+        m_scheduledDebuggerStep = NoStep;
+        debugger().setPauseOnNextStatement(false);
+        if (m_startingStepIntoAsync && m_pausingAsyncOperations.isEmpty())
+            clearStepIntoAsync();
+    }
+}
+
+void V8DebuggerAgent::traceAsyncOperationCompleted(int operationId)
+{
+    ASSERT(operationId > 0 || operationId == unknownAsyncOperationId);
+    bool shouldNotify = false;
+    if (operationId > 0) {
+        if (m_currentAsyncOperationId == operationId) {
+            if (m_pendingTraceAsyncOperationCompleted) {
+                m_pendingTraceAsyncOperationCompleted = false;
+            } else {
+                // Delay traceAsyncOperationCompleted() until the last async callback (being currently executed) is done.
+                m_pendingTraceAsyncOperationCompleted = true;
+                return;
+            }
+        }
+        m_asyncOperations.remove(operationId);
+        m_asyncOperationBreakpoints.remove(operationId);
+        m_pausingAsyncOperations.remove(operationId);
+        shouldNotify = !m_asyncOperationNotifications.take(operationId);
+    }
+    if (m_startingStepIntoAsync) {
+        if (!m_pausingOnAsyncOperation && m_pausingAsyncOperations.isEmpty())
+            clearStepIntoAsync();
+    }
+    if (m_frontend && shouldNotify)
+        m_frontend->asyncOperationCompleted(operationId);
+}
+
+void V8DebuggerAgent::flushAsyncOperationEvents(ErrorString*)
+{
+    if (!m_frontend)
+        return;
+
+    for (int operationId : m_asyncOperationNotifications) {
+        RefPtrWillBeRawPtr<AsyncCallChain> chain = m_asyncOperations.get(operationId);
+        ASSERT(chain);
+        const AsyncCallStackVector& callStacks = chain->callStacks();
+        ASSERT(!callStacks.isEmpty());
+
+        RefPtr<AsyncOperation> operation;
+        RefPtr<AsyncStackTrace> lastAsyncStackTrace;
+        for (const auto& callStack : callStacks) {
+            v8::HandleScope scope(m_isolate);
+            RefPtrWillBeRawPtr<ScriptCallStack> scriptCallStack = toScriptCallStack(callStack->callFrames(m_isolate));
+            if (!scriptCallStack)
+                break;
+            if (!operation) {
+                operation = AsyncOperation::create()
+                    .setId(operationId)
+                    .setDescription(callStack->description())
+                    .release();
+                operation->setStackTrace(scriptCallStack->buildInspectorArray());
+                continue;
+            }
+            RefPtr<AsyncStackTrace> asyncStackTrace = AsyncStackTrace::create()
+                .setCallFrames(scriptCallStack->buildInspectorArray());
+            asyncStackTrace->setDescription(callStack->description());
+            if (lastAsyncStackTrace)
+                lastAsyncStackTrace->setAsyncStackTrace(asyncStackTrace);
+            else
+                operation->setAsyncStackTrace(asyncStackTrace);
+            lastAsyncStackTrace = asyncStackTrace.release();
+        }
+
+        if (operation)
+            m_frontend->asyncOperationStarted(operation.release());
+    }
+
+    m_asyncOperationNotifications.clear();
+}
+
+void V8DebuggerAgent::clearCurrentAsyncOperation()
+{
+    if (m_pendingTraceAsyncOperationCompleted && m_currentAsyncOperationId != unknownAsyncOperationId)
+        traceAsyncOperationCompleted(m_currentAsyncOperationId);
+
+    m_currentAsyncOperationId = unknownAsyncOperationId;
+    m_pendingTraceAsyncOperationCompleted = false;
+    m_nestedAsyncCallCount = 0;
+    m_currentAsyncCallChain.clear();
+}
+
+void V8DebuggerAgent::resetAsyncCallTracker()
+{
+    clearCurrentAsyncOperation();
+    clearStepIntoAsync();
+    for (auto& listener: m_asyncCallTrackingListeners)
+        listener->resetAsyncOperations();
+    m_asyncOperations.clear();
+    m_asyncOperationNotifications.clear();
+    m_asyncOperationBreakpoints.clear();
+}
+
+void V8DebuggerAgent::setAsyncOperationBreakpoint(ErrorString* errorString, int operationId)
+{
+    if (!trackingAsyncCalls()) {
+        *errorString = "Can only perform operation while tracking async call stacks.";
+        return;
+    }
+    if (operationId <= 0) {
+        *errorString = "Wrong async operation id.";
+        return;
+    }
+    if (!m_asyncOperations.contains(operationId)) {
+        *errorString = "Unknown async operation id.";
+        return;
+    }
+    m_asyncOperationBreakpoints.add(operationId);
+}
+
+void V8DebuggerAgent::removeAsyncOperationBreakpoint(ErrorString* errorString, int operationId)
+{
+    if (!trackingAsyncCalls()) {
+        *errorString = "Can only perform operation while tracking async call stacks.";
+        return;
+    }
+    if (operationId <= 0) {
+        *errorString = "Wrong async operation id.";
+        return;
+    }
+    m_asyncOperationBreakpoints.remove(operationId);
+}
+
+void V8DebuggerAgent::addAsyncCallTrackingListener(AsyncCallTrackingListener* listener)
+{
+    m_asyncCallTrackingListeners.add(listener);
+}
+
+void V8DebuggerAgent::removeAsyncCallTrackingListener(AsyncCallTrackingListener* listener)
+{
+    ASSERT(m_asyncCallTrackingListeners.contains(listener));
+    m_asyncCallTrackingListeners.remove(listener);
+}
+
+void V8DebuggerAgent::willExecuteScript(int scriptId)
+{
+    changeJavaScriptRecursionLevel(+1);
+    // Fast return.
+    if (m_scheduledDebuggerStep != StepInto)
+        return;
+    // Skip unknown scripts (e.g. InjectedScript).
+    if (!m_scripts.contains(String::number(scriptId)))
+        return;
+    schedulePauseOnNextStatementIfSteppingInto();
+}
+
+void V8DebuggerAgent::didExecuteScript()
+{
+    changeJavaScriptRecursionLevel(-1);
+}
+
+void V8DebuggerAgent::changeJavaScriptRecursionLevel(int step)
+{
+    if (m_javaScriptPauseScheduled && !m_skipAllPauses && !isPaused()) {
+        // Do not ever loose user's pause request until we have actually paused.
+        debugger().setPauseOnNextStatement(true);
+    }
+    if (m_scheduledDebuggerStep == StepOut) {
+        m_recursionLevelForStepOut += step;
+        if (!m_recursionLevelForStepOut) {
+            // When StepOut crosses a task boundary (i.e. js -> blink_c++) from where it was requested,
+            // switch stepping to step into a next JS task, as if we exited to a blackboxed framework.
+            m_scheduledDebuggerStep = StepInto;
+            m_skipNextDebuggerStepOut = false;
+        }
+    }
+    if (m_recursionLevelForStepFrame) {
+        m_recursionLevelForStepFrame += step;
+        if (!m_recursionLevelForStepFrame) {
+            // We have walked through a blackboxed framework and got back to where we started.
+            // If there was no stepping scheduled, we should cancel the stepping explicitly,
+            // since there may be a scheduled StepFrame left.
+            // Otherwise, if we were stepping in/over, the StepFrame will stop at the right location,
+            // whereas if we were stepping out, we should continue doing so after debugger pauses
+            // from the old StepFrame.
+            m_skippedStepFrameCount = 0;
+            if (m_scheduledDebuggerStep == NoStep)
+                debugger().clearStepping();
+            else if (m_scheduledDebuggerStep == StepOut)
+                m_skipNextDebuggerStepOut = true;
+        }
+    }
+}
+
+PassRefPtr<Array<CallFrame>> V8DebuggerAgent::currentCallFrames()
+{
+    if (!m_pausedScriptState || m_currentCallStack.IsEmpty())
+        return Array<CallFrame>::create();
+    InjectedScript injectedScript = m_injectedScriptManager->injectedScriptFor(m_pausedScriptState.get());
+    if (injectedScript.isEmpty()) {
+        ASSERT_NOT_REACHED();
+        return Array<CallFrame>::create();
+    }
+
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Object> currentCallStack = m_currentCallStack.Get(m_isolate);
+    return injectedScript.wrapCallFrames(currentCallStack, 0);
+}
+
+PassRefPtr<StackTrace> V8DebuggerAgent::currentAsyncStackTrace()
+{
+    if (!m_pausedScriptState || !trackingAsyncCalls())
+        return nullptr;
+    const AsyncCallChain* chain = m_currentAsyncCallChain.get();
+    if (!chain)
+        return nullptr;
+    const AsyncCallStackVector& callStacks = chain->callStacks();
+    if (callStacks.isEmpty())
+        return nullptr;
+    RefPtr<StackTrace> result;
+    int asyncOrdinal = callStacks.size();
+    for (AsyncCallStackVector::const_reverse_iterator it = callStacks.rbegin(); it != callStacks.rend(); ++it, --asyncOrdinal) {
+        v8::HandleScope scope(m_isolate);
+        v8::Local<v8::Object> callFrames = (*it)->callFrames(m_isolate);
+        ScriptState* scriptState =  ScriptState::from(callFrames->CreationContext());
+        InjectedScript injectedScript = scriptState ? m_injectedScriptManager->injectedScriptFor(scriptState) : InjectedScript();
+        if (injectedScript.isEmpty()) {
+            result.clear();
+            continue;
+        }
+        RefPtr<StackTrace> next = StackTrace::create()
+            .setCallFrames(injectedScript.wrapCallFrames(callFrames, asyncOrdinal))
+            .release();
+        next->setDescription((*it)->description());
+        if (result)
+            next->setAsyncStackTrace(result.release());
+        result.swap(next);
+    }
+    return result.release();
+}
+
+PassRefPtrWillBeRawPtr<ScriptAsyncCallStack> V8DebuggerAgent::currentAsyncStackTraceForConsole()
+{
+    if (!trackingAsyncCalls())
+        return nullptr;
+    const AsyncCallChain* chain = m_currentAsyncCallChain.get();
+    if (!chain)
+        return nullptr;
+    const AsyncCallStackVector& callStacks = chain->callStacks();
+    if (callStacks.isEmpty())
+        return nullptr;
+    RefPtrWillBeRawPtr<ScriptAsyncCallStack> result = nullptr;
+    for (AsyncCallStackVector::const_reverse_iterator it = callStacks.rbegin(); it != callStacks.rend(); ++it) {
+        v8::HandleScope scope(m_isolate);
+        RefPtr<JavaScriptCallFrame> callFrame = toJavaScriptCallFrame((*it)->callFrames(m_isolate));
+        if (!callFrame)
+            break;
+        result = ScriptAsyncCallStack::create((*it)->description(), toScriptCallStack(callFrame.get()), result.release());
+    }
+    return result.release();
+}
+
+String V8DebuggerAgent::sourceMapURLForScript(const Script& script, CompileResult compileResult)
+{
+    bool hasSyntaxError = compileResult != CompileSuccess;
+    if (!hasSyntaxError)
+        return script.sourceMappingURL();
+    return ContentSearchUtils::findSourceMapURL(script.source(), ContentSearchUtils::JavaScriptMagicComment);
+}
+
+// V8DebuggerListener functions
+
+void V8DebuggerAgent::didParseSource(const ParsedScript& parsedScript)
+{
+    Script script = parsedScript.script;
+
+    bool hasSyntaxError = parsedScript.compileResult != CompileSuccess;
+    if (hasSyntaxError)
+        script.setSourceURL(ContentSearchUtils::findSourceURL(script.source(), ContentSearchUtils::JavaScriptMagicComment));
+
+    bool isContentScript = script.isContentScript();
+    bool isInternalScript = script.isInternalScript();
+    bool hasSourceURL = script.hasSourceURL();
+    String scriptURL = script.sourceURL();
+    String sourceMapURL = sourceMapURLForScript(script, parsedScript.compileResult);
+
+    const String* sourceMapURLParam = sourceMapURL.isNull() ? nullptr : &sourceMapURL;
+    const bool* isContentScriptParam = isContentScript ? &isContentScript : nullptr;
+    const bool* isInternalScriptParam = isInternalScript ? &isInternalScript : nullptr;
+    const bool* hasSourceURLParam = hasSourceURL ? &hasSourceURL : nullptr;
+    if (!hasSyntaxError)
+        m_frontend->scriptParsed(parsedScript.scriptId, scriptURL, script.startLine(), script.startColumn(), script.endLine(), script.endColumn(), isContentScriptParam, isInternalScriptParam, sourceMapURLParam, hasSourceURLParam);
+    else
+        m_frontend->scriptFailedToParse(parsedScript.scriptId, scriptURL, script.startLine(), script.startColumn(), script.endLine(), script.endColumn(), isContentScriptParam, isInternalScriptParam, sourceMapURLParam, hasSourceURLParam);
+
+    m_scripts.set(parsedScript.scriptId, script);
+
+    if (scriptURL.isEmpty() || hasSyntaxError)
+        return;
+
+    RefPtr<JSONObject> breakpointsCookie = m_state->getObject(DebuggerAgentState::javaScriptBreakpoints);
+    for (auto& cookie : *breakpointsCookie) {
+        RefPtr<JSONObject> breakpointObject = cookie.value->asObject();
+        bool isRegex;
+        breakpointObject->getBoolean(DebuggerAgentState::isRegex, &isRegex);
+        String url;
+        breakpointObject->getString(DebuggerAgentState::url, &url);
+        if (!matches(scriptURL, url, isRegex))
+            continue;
+        ScriptBreakpoint breakpoint;
+        breakpointObject->getNumber(DebuggerAgentState::lineNumber, &breakpoint.lineNumber);
+        breakpointObject->getNumber(DebuggerAgentState::columnNumber, &breakpoint.columnNumber);
+        breakpointObject->getString(DebuggerAgentState::condition, &breakpoint.condition);
+        RefPtr<TypeBuilder::Debugger::Location> location = resolveBreakpoint(cookie.key, parsedScript.scriptId, breakpoint, UserBreakpointSource);
+        if (location)
+            m_frontend->breakpointResolved(cookie.key, location);
+    }
+}
+
+V8DebuggerListener::SkipPauseRequest V8DebuggerAgent::didPause(v8::Local<v8::Context> context, v8::Local<v8::Object> callFrames, v8::Local<v8::Value> v8exception, const Vector<String>& hitBreakpoints, bool isPromiseRejection)
+{
+    ScriptState* scriptState = ScriptState::from(context);
+    ScriptValue exception(scriptState, v8exception);
+
+    V8DebuggerListener::SkipPauseRequest result;
+    if (m_skipAllPauses)
+        result = V8DebuggerListener::Continue;
+    else if (!hitBreakpoints.isEmpty())
+        result = V8DebuggerListener::NoSkip; // Don't skip explicit breakpoints even if set in frameworks.
+    else if (!exception.isEmpty())
+        result = shouldSkipExceptionPause();
+    else if (m_scheduledDebuggerStep != NoStep || m_javaScriptPauseScheduled || m_pausingOnNativeEvent)
+        result = shouldSkipStepPause();
+    else
+        result = V8DebuggerListener::NoSkip;
+
+    m_skipNextDebuggerStepOut = false;
+    if (result != V8DebuggerListener::NoSkip)
+        return result;
+
+    // Skip pauses inside V8 internal scripts and on syntax errors.
+    if (callFrames.IsEmpty())
+        return V8DebuggerListener::Continue;
+
+    ASSERT(scriptState);
+    ASSERT(!m_pausedScriptState);
+    m_pausedScriptState = scriptState;
+    m_currentCallStack.Reset(m_isolate, callFrames);
+
+    if (!exception.isEmpty()) {
+        InjectedScript injectedScript = m_injectedScriptManager->injectedScriptFor(scriptState);
+        if (!injectedScript.isEmpty()) {
+            m_breakReason = isPromiseRejection ? InspectorFrontend::Debugger::Reason::PromiseRejection : InspectorFrontend::Debugger::Reason::Exception;
+            m_breakAuxData = injectedScript.wrapObject(exception, V8DebuggerAgent::backtraceObjectGroup)->openAccessors();
+            // m_breakAuxData might be null after this.
+        }
+    } else if (m_pausingOnAsyncOperation) {
+        m_breakReason = InspectorFrontend::Debugger::Reason::AsyncOperation;
+        m_breakAuxData = JSONObject::create();
+        m_breakAuxData->setNumber("operationId", m_currentAsyncOperationId);
+    }
+
+    RefPtr<Array<String>> hitBreakpointIds = Array<String>::create();
+
+    for (const auto& point : hitBreakpoints) {
+        DebugServerBreakpointToBreakpointIdAndSourceMap::iterator breakpointIterator = m_serverBreakpoints.find(point);
+        if (breakpointIterator != m_serverBreakpoints.end()) {
+            const String& localId = breakpointIterator->value.first;
+            hitBreakpointIds->addItem(localId);
+
+            BreakpointSource source = breakpointIterator->value.second;
+            if (m_breakReason == InspectorFrontend::Debugger::Reason::Other && source == DebugCommandBreakpointSource)
+                m_breakReason = InspectorFrontend::Debugger::Reason::DebugCommand;
+        }
+    }
+
+    if (!m_asyncOperationNotifications.isEmpty())
+        flushAsyncOperationEvents(nullptr);
+
+    m_frontend->paused(currentCallFrames(), m_breakReason, m_breakAuxData, hitBreakpointIds, currentAsyncStackTrace());
+    m_scheduledDebuggerStep = NoStep;
+    m_javaScriptPauseScheduled = false;
+    m_steppingFromFramework = false;
+    m_pausingOnNativeEvent = false;
+    m_skippedStepFrameCount = 0;
+    m_recursionLevelForStepFrame = 0;
+    clearStepIntoAsync();
+
+    if (!m_continueToLocationBreakpointId.isEmpty()) {
+        debugger().removeBreakpoint(m_continueToLocationBreakpointId);
+        m_continueToLocationBreakpointId = "";
+    }
+    return result;
+}
+
+void V8DebuggerAgent::didContinue()
+{
+    m_pausedScriptState = nullptr;
+    m_currentCallStack.Reset();
+    clearBreakDetails();
+    m_frontend->resumed();
+}
+
+bool V8DebuggerAgent::canBreakProgram()
+{
+    return debugger().canBreakProgram();
+}
+
+void V8DebuggerAgent::breakProgram(InspectorFrontend::Debugger::Reason::Enum breakReason, PassRefPtr<JSONObject> data)
+{
+    ASSERT(enabled());
+    if (m_skipAllPauses || m_pausedScriptState || isCallStackEmptyOrBlackboxed())
+        return;
+    m_breakReason = breakReason;
+    m_breakAuxData = data;
+    m_scheduledDebuggerStep = NoStep;
+    m_steppingFromFramework = false;
+    m_pausingOnNativeEvent = false;
+    clearStepIntoAsync();
+    debugger().breakProgram();
+}
+
+void V8DebuggerAgent::clearStepIntoAsync()
+{
+    m_startingStepIntoAsync = false;
+    m_pausingOnAsyncOperation = false;
+    m_pausingAsyncOperations.clear();
+}
+
+bool V8DebuggerAgent::assertPaused(ErrorString* errorString)
+{
+    if (!m_pausedScriptState) {
+        *errorString = "Can only perform operation while paused.";
+        return false;
+    }
+    return true;
+}
+
+void V8DebuggerAgent::clearBreakDetails()
+{
+    m_breakReason = InspectorFrontend::Debugger::Reason::Other;
+    m_breakAuxData = nullptr;
+}
+
+void V8DebuggerAgent::setBreakpoint(const String& scriptId, int lineNumber, int columnNumber, BreakpointSource source, const String& condition)
+{
+    String breakpointId = generateBreakpointId(scriptId, lineNumber, columnNumber, source);
+    ScriptBreakpoint breakpoint(lineNumber, columnNumber, condition);
+    resolveBreakpoint(breakpointId, scriptId, breakpoint, source);
+}
+
+void V8DebuggerAgent::removeBreakpoint(const String& scriptId, int lineNumber, int columnNumber, BreakpointSource source)
+{
+    removeBreakpoint(generateBreakpointId(scriptId, lineNumber, columnNumber, source));
+}
+
+void V8DebuggerAgent::reset()
+{
+    m_scheduledDebuggerStep = NoStep;
+    m_scripts.clear();
+    m_breakpointIdToDebuggerBreakpointIds.clear();
+    resetAsyncCallTracker();
+    m_promiseTracker->clear();
+    if (m_frontend)
+        m_frontend->globalObjectCleared();
+}
+
+PassRefPtr<TypeBuilder::Debugger::ExceptionDetails> V8DebuggerAgent::createExceptionDetails(v8::Isolate* isolate, v8::Local<v8::Message> message)
+{
+    RefPtr<ExceptionDetails> exceptionDetails = ExceptionDetails::create().setText(toCoreStringWithUndefinedOrNullCheck(message->Get()));
+    exceptionDetails->setLine(message->GetLineNumber());
+    exceptionDetails->setColumn(message->GetStartColumn());
+    v8::Local<v8::StackTrace> messageStackTrace = message->GetStackTrace();
+    if (!messageStackTrace.IsEmpty() && messageStackTrace->GetFrameCount() > 0)
+        exceptionDetails->setStackTrace(createScriptCallStack(isolate, messageStackTrace, messageStackTrace->GetFrameCount())->buildInspectorArray());
+    return exceptionDetails.release();
+}
+
+} // namespace blink