[PTZ] Measure image capture constraints usage

This change will allow us to measure image capture constraints usage and
to decide if we can put the existing "zoom" constraint behind a
permission prompt without much difficulty.

Test: Go to beaufortfrancois.github.io/sandbox/image-capture/playground
and check chrome://histograms/Blink.UseCounter.Features is updated with
requested constraints.

Bug: 934063
Change-Id: I4f5bcb6fc2b9b0c860127c4167fd2258fbaee975
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151586Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#760216}

third_party/blink/public/mojom/web_feature/web_feature.mojom

@@ -2570,6 +2570,23 @@ enum WebFeature {
   kRequiredDocumentPolicy = 3230,
   kPerformanceObserverEntryTypesAndBuffered = 3231,
   kPerformanceObserverTypeError = 3232,
+  kImageCaptureWhiteBalanceMode = 3233,
+  kImageCaptureExposureMode = 3234,
+  kImageCaptureFocusMode = 3235,
+  kImageCapturePointsOfInterest = 3236,
+  kImageCaptureExposureCompensation = 3237,
+  kImageCaptureExposureTime = 3238,
+  kImageCaptureColorTemperature = 3239,
+  kImageCaptureIso = 3240,
+  kImageCaptureBrightness = 3241,
+  kImageCaptureContrast = 3242,
+  kImageCaptureSaturation = 3243,
+  kImageCaptureSharpness = 3244,
+  kImageCaptureFocusDistance = 3245,
+  kImageCapturePan = 3246,
+  kImageCaptureTilt = 3247,
+  kImageCaptureZoom = 3248,
+  kImageCaptureTorch = 3249,
 
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.

third_party/blink/renderer/modules/imagecapture/image_capture.cc

@@ -24,6 +24,7 @@
 #include "third_party/blink/renderer/modules/imagecapture/photo_capabilities.h"
 #include "third_party/blink/renderer/modules/mediastream/media_stream_track.h"
 #include "third_party/blink/renderer/platform/heap/heap.h"
+#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
 #include "third_party/blink/renderer/platform/mojo/mojo_helper.h"
 #include "third_party/blink/renderer/platform/wtf/functional.h"
 
@@ -343,13 +344,50 @@ void ImageCapture::SetMediaTrackConstraints(
     ScriptPromiseResolver* resolver,
     const HeapVector<Member<MediaTrackConstraintSet>>& constraints_vector) {
   DCHECK_GT(constraints_vector.size(), 0u);
+  // TODO(mcasas): add support more than one single advanced constraint.
+  const MediaTrackConstraintSet* constraints = constraints_vector[0];
+
+  ExecutionContext* context = GetExecutionContext();
+  if (constraints->hasWhiteBalanceMode())
+    UseCounter::Count(context, WebFeature::kImageCaptureWhiteBalanceMode);
+  if (constraints->hasExposureMode())
+    UseCounter::Count(context, WebFeature::kImageCaptureExposureMode);
+  if (constraints->hasFocusMode())
+    UseCounter::Count(context, WebFeature::kImageCaptureFocusMode);
+  if (constraints->hasPointsOfInterest())
+    UseCounter::Count(context, WebFeature::kImageCapturePointsOfInterest);
+  if (constraints->hasExposureCompensation())
+    UseCounter::Count(context, WebFeature::kImageCaptureExposureCompensation);
+  if (constraints->hasExposureTime())
+    UseCounter::Count(context, WebFeature::kImageCaptureExposureTime);
+  if (constraints->hasColorTemperature())
+    UseCounter::Count(context, WebFeature::kImageCaptureColorTemperature);
+  if (constraints->hasIso())
+    UseCounter::Count(context, WebFeature::kImageCaptureIso);
+  if (constraints->hasBrightness())
+    UseCounter::Count(context, WebFeature::kImageCaptureBrightness);
+  if (constraints->hasContrast())
+    UseCounter::Count(context, WebFeature::kImageCaptureContrast);
+  if (constraints->hasSaturation())
+    UseCounter::Count(context, WebFeature::kImageCaptureSaturation);
+  if (constraints->hasSharpness())
+    UseCounter::Count(context, WebFeature::kImageCaptureSharpness);
+  if (constraints->hasFocusDistance())
+    UseCounter::Count(context, WebFeature::kImageCaptureFocusDistance);
+  if (constraints->hasPan())
+    UseCounter::Count(context, WebFeature::kImageCapturePan);
+  if (constraints->hasTilt())
+    UseCounter::Count(context, WebFeature::kImageCaptureTilt);
+  if (constraints->hasZoom())
+    UseCounter::Count(context, WebFeature::kImageCaptureZoom);
+  if (constraints->hasTorch())
+    UseCounter::Count(context, WebFeature::kImageCaptureTorch);
+
   if (!service_.is_bound()) {
     resolver->Reject(MakeGarbageCollected<DOMException>(
         DOMExceptionCode::kNotFoundError, kNoServiceError));
     return;
   }
-  // TODO(mcasas): add support more than one single advanced constraint.
-  const MediaTrackConstraintSet* constraints = constraints_vector[0];
 
   if ((constraints->hasWhiteBalanceMode() &&
        !capabilities_->hasWhiteBalanceMode()) ||

tools/metrics/histograms/enums.xml

@@ -26995,6 +26995,23 @@ Called by update_use_counter_feature_enum.py.-->
   <int value="3230" label="RequiredDocumentPolicy"/>
   <int value="3231" label="PerformanceObserverEntryTypesAndBuffered"/>
   <int value="3232" label="PerformanceObserverTypeError"/>
+  <int value="3233" label="ImageCaptureWhiteBalanceMode"/>
+  <int value="3234" label="ImageCaptureExposureMode"/>
+  <int value="3235" label="ImageCaptureFocusMode"/>
+  <int value="3236" label="ImageCapturePointsOfInterest"/>
+  <int value="3237" label="ImageCaptureExposureCompensation"/>
+  <int value="3238" label="ImageCaptureExposureTime"/>
+  <int value="3239" label="ImageCaptureColorTemperature"/>
+  <int value="3240" label="ImageCaptureIso"/>
+  <int value="3241" label="ImageCaptureBrightness"/>
+  <int value="3242" label="ImageCaptureContrast"/>
+  <int value="3243" label="ImageCaptureSaturation"/>
+  <int value="3244" label="ImageCaptureSharpness"/>
+  <int value="3245" label="ImageCaptureFocusDistance"/>
+  <int value="3246" label="ImageCapturePan"/>
+  <int value="3247" label="ImageCaptureTilt"/>
+  <int value="3248" label="ImageCaptureZoom"/>
+  <int value="3249" label="ImageCaptureTorch"/>
 </enum>
 
 <enum name="FeaturePolicyAllowlistType">