Fix SharedSampler to cope correctly with zero-thread processes.

chrome/browser/task_manager/sampling/shared_sampler_win.cc

Index: chrome/browser/task_manager/sampling/shared_sampler_win.cc
diff --git a/chrome/browser/task_manager/sampling/shared_sampler_win.cc b/chrome/browser/task_manager/sampling/shared_sampler_win.cc
index 4cd06e986356e47e9d70536d15eb17bc3df8475d..e54e2f8295795c7be25563d0f41d3d330498eecf 100644
--- a/chrome/browser/task_manager/sampling/shared_sampler_win.cc
+++ b/chrome/browser/task_manager/sampling/shared_sampler_win.cc
@@ -457,10 +457,12 @@ std::unique_ptr<ProcessDataSnapshot> SharedSampler::CaptureSnapshot() {
     // the buffer boundary.
     if (offset + sizeof(SYSTEM_PROCESS_INFORMATION) > data_buffer.size())
       break;
-    if (offset + sizeof(SYSTEM_PROCESS_INFORMATION) +
-            (pi->NumberOfThreads - 1) * sizeof(SYSTEM_THREAD_INFORMATION) >
-      data_buffer.size())
+    if (pi->NumberOfThreads > 0 &&
+        (offset + sizeof(SYSTEM_PROCESS_INFORMATION) +
+             (pi->NumberOfThreads - 1) * sizeof(SYSTEM_THREAD_INFORMATION) >
+         data_buffer.size())) {
       break;
+    }
 
     if (pi->ImageName.Buffer) {
       // Validate that the image name is within the buffer boundary.