Rename GrDrawContext to GrRenderTargetContext

This is in preparation for GrTextureContext and GrSurfaceContext

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4030

Change-Id: Ie58c93052e68f3f1f5fe8d15d63760de274a6fbd
Reviewed-on: https://skia-review.googlesource.com/4030
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/gm/beziereffects.cpp b/gm/beziereffects.cpp
index 3dd4d65..c6d58e1 100644
--- a/gm/beziereffects.cpp
+++ b/gm/beziereffects.cpp
@@ -11,7 +11,7 @@
 
 #if SK_SUPPORT_GPU
 
-#include "GrDrawContextPriv.h"
+#include "GrRenderTargetContextPriv.h"
 #include "GrContext.h"
 #include "GrPathUtils.h"
 #include "GrTest.h"
@@ -99,8 +99,9 @@
     }
 
     void onDraw(SkCanvas* canvas) override {
-        GrDrawContext* drawContext = canvas->internal_private_accessTopLayerDrawContext();
-        if (!drawContext) {
+        GrRenderTargetContext* renderTargetContext =
+            canvas->internal_private_accessTopLayerRenderTargetContext();
+        if (!renderTargetContext) {
             skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }
@@ -121,8 +122,8 @@
         // Mult by 3 for each edge effect type
         int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumCubics*3)));
         int numRows = SkScalarCeilToInt(SkIntToScalar(kNumCubics*3) / numCols);
-        SkScalar w = SkIntToScalar(drawContext->width()) / numCols;
-        SkScalar h = SkIntToScalar(drawContext->height()) / numRows;
+        SkScalar w = SkIntToScalar(renderTargetContext->width()) / numCols;
+        SkScalar h = SkIntToScalar(renderTargetContext->height()) / numRows;
         int row = 0;
         int col = 0;
         constexpr GrColor color = 0xff000000;
@@ -194,7 +195,8 @@
                     SkAutoTUnref<GrDrawBatch> batch(
                         new BezierCubicOrConicTestBatch(gp, bounds, color, klmEqs, klmSigns[c]));
 
-                    drawContext->drawContextPriv().testingOnly_drawBatch(grPaint, batch);
+                    renderTargetContext->renderTargetContextPriv().testingOnly_drawBatch(grPaint,
+                                                                                         batch);
                 }
                 ++col;
                 if (numCols == col) {
@@ -231,8 +233,9 @@
 
 
     void onDraw(SkCanvas* canvas) override {
-        GrDrawContext* drawContext = canvas->internal_private_accessTopLayerDrawContext();
-        if (!drawContext) {
+        GrRenderTargetContext* renderTargetContext =
+            canvas->internal_private_accessTopLayerRenderTargetContext();
+        if (!renderTargetContext) {
             skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }
@@ -253,8 +256,8 @@
         // Mult by 3 for each edge effect type
         int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumConics*3)));
         int numRows = SkScalarCeilToInt(SkIntToScalar(kNumConics*3) / numCols);
-        SkScalar w = SkIntToScalar(drawContext->width()) / numCols;
-        SkScalar h = SkIntToScalar(drawContext->height()) / numRows;
+        SkScalar w = SkIntToScalar(renderTargetContext->width()) / numCols;
+        SkScalar h = SkIntToScalar(renderTargetContext->height()) / numRows;
         int row = 0;
         int col = 0;
         constexpr GrColor color = 0xff000000;
@@ -325,7 +328,8 @@
                     SkAutoTUnref<GrDrawBatch> batch(
                         new BezierCubicOrConicTestBatch(gp, bounds, color, klmEqs, 1.f));
 
-                    drawContext->drawContextPriv().testingOnly_drawBatch(grPaint, batch);
+                    renderTargetContext->renderTargetContextPriv().testingOnly_drawBatch(grPaint,
+                                                                                         batch);
                 }
                 ++col;
                 if (numCols == col) {
@@ -445,8 +449,9 @@
 
 
     void onDraw(SkCanvas* canvas) override {
-        GrDrawContext* drawContext = canvas->internal_private_accessTopLayerDrawContext();
-        if (!drawContext) {
+        GrRenderTargetContext* renderTargetContext =
+            canvas->internal_private_accessTopLayerRenderTargetContext();
+        if (!renderTargetContext) {
             skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }
@@ -466,8 +471,8 @@
 
         int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumQuads*3)));
         int numRows = SkScalarCeilToInt(SkIntToScalar(kNumQuads*3) / numCols);
-        SkScalar w = SkIntToScalar(drawContext->width()) / numCols;
-        SkScalar h = SkIntToScalar(drawContext->height()) / numRows;
+        SkScalar w = SkIntToScalar(renderTargetContext->width()) / numCols;
+        SkScalar h = SkIntToScalar(renderTargetContext->height()) / numRows;
         int row = 0;
         int col = 0;
         constexpr GrColor color = 0xff000000;
@@ -536,7 +541,8 @@
                     SkAutoTUnref<GrDrawBatch> batch(
                         new BezierQuadTestBatch(gp, bounds, color, DevToUV));
 
-                    drawContext->drawContextPriv().testingOnly_drawBatch(grPaint, batch);
+                    renderTargetContext->renderTargetContextPriv().testingOnly_drawBatch(grPaint,
+                                                                                         batch);
                 }
                 ++col;
                 if (numCols == col) {