[inspector] extend protocol for code coverage.

src/inspector/v8-runtime-agent-impl.cc

Index: src/inspector/v8-runtime-agent-impl.cc
diff --git a/src/inspector/v8-runtime-agent-impl.cc b/src/inspector/v8-runtime-agent-impl.cc
index b40f08ed065f366302cb196d4566e11f4acfc904..99dbbe0c8b67981824913e1b3f43e351aa3eed13 100644
--- a/src/inspector/v8-runtime-agent-impl.cc
+++ b/src/inspector/v8-runtime-agent-impl.cc
@@ -30,6 +30,7 @@
 
 #include "src/inspector/v8-runtime-agent-impl.h"
 
+#include "src/debug/debug-interface.h"
 #include "src/inspector/injected-script.h"
 #include "src/inspector/inspected-context.h"
 #include "src/inspector/protocol/Protocol.h"
@@ -645,6 +646,62 @@ void V8RuntimeAgentImpl::runScript(
       std::move(callback));
 }
 
+Response V8RuntimeAgentImpl::startPreciseCoverage() {
+  v8::debug::Coverage::TogglePrecise(m_inspector->isolate(), true);
+  return Response::OK();
+}
+
+Response V8RuntimeAgentImpl::stopPreciseCoverage() {
+  v8::debug::Coverage::TogglePrecise(m_inspector->isolate(), false);
+  return Response::OK();
+}
+
+namespace {
+std::unique_ptr<protocol::Runtime::CoverageRange> CreateCoverageRange(
+    v8::debug::Coverage::Range range) {
+  std::unique_ptr<protocol::Array<protocol::Runtime::CoverageRange>> nested =
+      protocol::Array<protocol::Runtime::CoverageRange>::create();
+  for (size_t i = 0; i < range.NestedCount(); i++) {
+    nested->addItem(CreateCoverageRange(range.GetNested(i)));
+  }
+  return protocol::Runtime::CoverageRange::create()
+      .setFunctionName(
+          toProtocolString(range.Name().FromMaybe(v8::Local<v8::String>())))
+      .setStartLineNumber(range.Start().GetLineNumber())
+      .setStartColumnNumber(range.Start().GetColumnNumber())
+      .setEndLineNumber(range.End().GetLineNumber())
+      .setEndColumnNumber(range.End().GetColumnNumber())
+      .setNested(std::move(nested))
+      .setCount(range.Count())
+      .build();
+}
+}  // anonymous namespace
+
+Response V8RuntimeAgentImpl::collectCoverage(
+    std::unique_ptr<protocol::Array<protocol::Runtime::ScriptCoverage>>*
+        out_result) {
+  std::unique_ptr<protocol::Array<protocol::Runtime::ScriptCoverage>> result =
+      protocol::Array<protocol::Runtime::ScriptCoverage>::create();
+  v8::HandleScope handle_scope(m_inspector->isolate());
+  v8::debug::Coverage coverage =
+      v8::debug::Coverage::Collect(m_inspector->isolate());
+  for (size_t i = 0; i < coverage.ScriptCount(); i++) {
+    v8::Local<v8::debug::Script> script = coverage.GetScript(i);
+    String16 url;
+    v8::Local<v8::String> name;
+    if (script->Name().ToLocal(&name) || script->SourceURL().ToLocal(&name)) {
+      url = toProtocolString(name);
+    }
+    result->addItem(protocol::Runtime::ScriptCoverage::create()
+                        .setScriptId(String16::fromInteger(script->Id()))
+                        .setUrl(url)
+                        .setToplevel(CreateCoverageRange(coverage.GetRange(i)))
+                        .build());
+  }
+  *out_result = std::move(result);
+  return Response::OK();
+}
+
 void V8RuntimeAgentImpl::restore() {
   if (!m_state->booleanProperty(V8RuntimeAgentImplState::runtimeEnabled, false))
     return;