cc: Add UMA for tracking decode duration for out of raster decodes.

cc/tiles/software_image_decode_cache.cc

Index: cc/tiles/software_image_decode_cache.cc
diff --git a/cc/tiles/software_image_decode_cache.cc b/cc/tiles/software_image_decode_cache.cc
index cc1f54fbda0c091f355f0c3a75c338d715879b3e..a4694530f2f0c5c1483fd7d27aabc8a56172fbc7 100644
--- a/cc/tiles/software_image_decode_cache.cc
+++ b/cc/tiles/software_image_decode_cache.cc
@@ -113,7 +113,8 @@ class ImageDecodeTaskImpl : public TileTask {
                  tracing_info_.prepare_tiles_id);
     devtools_instrumentation::ScopedImageDecodeTask image_decode_task(
         image_.image().get(),
-        devtools_instrumentation::ScopedImageDecodeTask::SOFTWARE);
+        devtools_instrumentation::ScopedImageDecodeTask::SOFTWARE,
+        ImageDecodeCache::ToScopedDecodeTaskType(tracing_info_.type));
     cache_->DecodeImage(image_key_, image_, task_type_);
   }
 
@@ -227,15 +228,19 @@ bool SoftwareImageDecodeCache::GetTaskForImageAndRef(
     const DrawImage& image,
     const TracingInfo& tracing_info,
     scoped_refptr<TileTask>* task) {
+  DCHECK_EQ(tracing_info.type, ImageDecodeType::IN_RASTER);
   return GetTaskForImageAndRefInternal(
       image, tracing_info, DecodeTaskType::USE_IN_RASTER_TASKS, task);
 }
 
 bool SoftwareImageDecodeCache::GetOutOfRasterDecodeTaskForImageAndRef(
     const DrawImage& image,
+    ImageDecodeType decode_type,
     scoped_refptr<TileTask>* task) {
-  return GetTaskForImageAndRefInternal(
-      image, TracingInfo(), DecodeTaskType::USE_OUT_OF_RASTER_TASKS, task);
+  DCHECK_NE(decode_type, ImageDecodeType::IN_RASTER);
+  return GetTaskForImageAndRefInternal(image, TracingInfo(decode_type),
+                                       DecodeTaskType::USE_OUT_OF_RASTER_TASKS,
+                                       task);
 }
 
 bool SoftwareImageDecodeCache::GetTaskForImageAndRefInternal(