Revert "Merge GrOpList and GrRTOpList and rename to GrOpsTask."

This reverts commit 2a5954140b49d18e5161a30a4ae2c7ac28bc1993.

Reason for revert: breaking everything

Original change's description:
> Merge GrOpList and GrRTOpList and rename to GrOpsTask.
> 
> Change-Id: I8f4f2218a30fd0541a8f79f7bb9850f9500cd243
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/236343
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: I27840ea0343e8e6b388556afb7bd2e76386d611d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/236349
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/tools/mdbviz/mainwindow.cpp b/tools/mdbviz/mainwindow.cpp
index e36f81a..5f5746b 100644
--- a/tools/mdbviz/mainwindow.cpp
+++ b/tools/mdbviz/mainwindow.cpp
@@ -27,8 +27,8 @@
     }
 }
 
-void MainWindow::setupOpsTaskWidget() {
-    fOpsTaskWidget->clear();
+void MainWindow::setupOpListWidget() {
+    fOpListWidget->clear();
 
     QTreeWidgetItem* item = nullptr;
     SkTDArray<QTreeWidgetItem*> parents;
@@ -45,7 +45,7 @@
         }
 
         if (parents.isEmpty()) {
-            fOpsTaskWidget->addTopLevelItem(item);
+            fOpListWidget->addTopLevelItem(item);
         } else {
             parents.top()->addChild(item);
         }
@@ -55,8 +55,8 @@
         }
     }
 
-    fOpsTaskWidget->setCurrentItem(item);
-    fOpsTaskWidget->expandToDepth(100);
+    fOpListWidget->setCurrentItem(item);
+    fOpListWidget->expandToDepth(100);
 }
 
 void MainWindow::presentCurrentRenderState() {
@@ -87,7 +87,7 @@
         return;
     }
 
-    this->setupOpsTaskWidget();
+    this->setupOpListWidget();
     this->presentCurrentRenderState();
 
 #ifndef QT_NO_CURSOR
@@ -147,25 +147,25 @@
 
     // Op List Window
     {
-        QDockWidget* opsTaskDock = new QDockWidget("Ops", this);
-        opsTaskDock->setAllowedAreas(Qt::LeftDockWidgetArea);
+        QDockWidget* opListDock = new QDockWidget("Ops", this);
+        opListDock->setAllowedAreas(Qt::LeftDockWidgetArea);
 
-        fOpsTaskWidget = new QTreeWidget(opsTaskDock);
+        fOpListWidget = new QTreeWidget(opListDock);
 
         QTreeWidgetItem* headerItem = new QTreeWidgetItem;
         headerItem->setText(0, "Index");
         headerItem->setText(1, "Op Name");
-        fOpsTaskWidget->setHeaderItem(headerItem);
+        fOpListWidget->setHeaderItem(headerItem);
 
-        fOpsTaskWidget->header()->setSectionResizeMode(0, QHeaderView::ResizeToContents);
-        fOpsTaskWidget->header()->setSectionResizeMode(1, QHeaderView::ResizeToContents);
+        fOpListWidget->header()->setSectionResizeMode(0, QHeaderView::ResizeToContents);
+        fOpListWidget->header()->setSectionResizeMode(1, QHeaderView::ResizeToContents);
 
-        opsTaskDock->setWidget(fOpsTaskWidget);
-        this->addDockWidget(Qt::LeftDockWidgetArea, opsTaskDock);
+        opListDock->setWidget(fOpListWidget);
+        this->addDockWidget(Qt::LeftDockWidgetArea, opListDock);
 
-        fViewMenu->addAction(opsTaskDock->toggleViewAction());
+        fViewMenu->addAction(opListDock->toggleViewAction());
 
-        connect(fOpsTaskWidget, SIGNAL(currentItemChanged(QTreeWidgetItem*,QTreeWidgetItem*)),
+        connect(fOpListWidget, SIGNAL(currentItemChanged(QTreeWidgetItem*,QTreeWidgetItem*)),
                 this, SLOT(onCurrentItemChanged(QTreeWidgetItem*, QTreeWidgetItem*)));
     }