Bug 1828065 - cherry-pick upstream libwebrtc commit 6fc1ae58be. r=webrtc-reviewers,mjf

Upstream commit: https://webrtc.googlesource.com/src/+/6fc1ae58be7cbb61ad0431d90eb7a7dc333de2f2
    In DeviceInfoDS check that out vars were set

    Bug: chromium:1441804
    Change-Id: Id07cb61519315d77c2d7cdab1053efaaf7473e1a
    Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/304060
    Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
    Reviewed-by: Per Kjellander <perkj@webrtc.org>
    Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
    Cr-Commit-Position: refs/heads/main@{#39982}

Differential Revision: https://phabricator.services.mozilla.com/D177236

third_party/libwebrtc/modules/video_capture/windows/device_info_ds.cc

@@ -505,9 +505,9 @@ int32_t DeviceInfoDS::CreateCapabilityMap(const char* deviceUniqueIdUTF8)
       }
 
       if (hrVC == S_OK) {
-        LONGLONG* frameDurationList;
-        LONGLONG maxFPS;
-        long listSize;
+        LONGLONG* frameDurationList = NULL;
+        LONGLONG maxFPS = 0;
+        long listSize = 0;
         SIZE size;
         size.cx = capability.width;
         size.cy = capability.height;
@@ -520,9 +520,10 @@ int32_t DeviceInfoDS::CreateCapabilityMap(const char* deviceUniqueIdUTF8)
         hrVC = videoControlConfig->GetFrameRateList(
             outputCapturePin, tmp, size, &listSize, &frameDurationList);
 
-        // On some odd cameras, you may get a 0 for duration.
-        // GetMaxOfFrameArray returns the lowest duration (highest FPS)
-        if (hrVC == S_OK && listSize > 0 &&
+        // On some odd cameras, you may get a 0 for duration. Some others may
+        // not update the out vars. GetMaxOfFrameArray returns the lowest
+        // duration (highest FPS), or 0 if there was no list with elements.
+        if (hrVC == S_OK &&
             0 != (maxFPS = GetMaxOfFrameArray(frameDurationList, listSize))) {
           capability.maxFPS = static_cast<int>(10000000 / maxFPS);
           capability.supportFrameRateControl = true;

third_party/libwebrtc/modules/video_capture/windows/help_functions_ds.cc

@@ -21,6 +21,9 @@ namespace webrtc {
 namespace videocapturemodule {
 // This returns minimum :), which will give max frame rate...
 LONGLONG GetMaxOfFrameArray(LONGLONG* maxFps, long size) {
+  if (!maxFps || size <= 0) {
+    return 0;
+  }
   LONGLONG maxFPS = maxFps[0];
   for (int i = 0; i < size; i++) {
     if (maxFPS > maxFps[i])