DevTools: Limit the script sources size retained solely by debugger.

BUG=v8:8988

Change-Id: I0a0cc3b95814656de1a602cc31bca2fe726dae79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1522193
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641659}

third_party/blink/renderer/devtools/front_end/sdk/DebuggerModel.js

@@ -116,7 +116,11 @@ SDK.DebuggerModel = class extends SDK.SDKModel {
       return Promise.resolve();
     this._debuggerEnabled = true;
 
-    const enablePromise = this._agent.enable();
+    // Set a limit for the total size of collected script sources retained by debugger.
+    // 10MB for remote frontends, 100MB for others.
+    const isRemoteFrontend = Runtime.queryParam('remoteFrontend') || Runtime.queryParam('ws');
+    const maxScriptsCacheSize = isRemoteFrontend ? 10e6 : 100e6;
+    const enablePromise = this._agent.enable(maxScriptsCacheSize);
     enablePromise.then(this._registerDebugger.bind(this));
     this._pauseOnExceptionStateChanged();
     this._asyncStackTracesStateChanged();

third_party/blink/web_tests/http/tests/devtools/profiler/agents-disabled-check-expected.txt

@@ -9,7 +9,7 @@ frontend: {"id":<number>,"method":"Overlay.disable"}
 frontend: {"id":<number>,"method":"Target.setAutoAttach","params":{"autoAttach":true,"waitForDebuggerOnStart":false,"flatten":true}}
 
 --> SDK.targetManager.resumeAllTargets();
-frontend: {"id":<number>,"method":"Debugger.enable"}
+frontend: {"id":<number>,"method":"Debugger.enable","params":{"maxScriptsCacheSize":100000000}}
 frontend: {"id":<number>,"method":"Debugger.setPauseOnExceptions","params":{"state":"none"}}
 frontend: {"id":<number>,"method":"Debugger.setAsyncCallStackDepth","params":{"maxDepth":32}}
 frontend: {"id":<number>,"method":"DOM.enable"}

third_party/blink/web_tests/http/tests/devtools/service-workers/service-worker-agents-expected.txt

@@ -3,6 +3,9 @@ Tests the way service workers don't enable DOM agent and does enable Debugger ag
 Debugger-related command should be issued: {
     "id": "<id>",
     "method": "Debugger.enable",
+    "params": {
+        "maxScriptsCacheSize": 100000000
+    },
     "sessionId": "<id>"
 }
 Suspending targets.
@@ -10,6 +13,9 @@ Resuming targets.
 Debugger-related command should be issued: {
     "id": "<id>",
     "method": "Debugger.enable",
+    "params": {
+        "maxScriptsCacheSize": 100000000
+    },
     "sessionId": "<id>"
 }