Don't dirty MIP chain when damage bounds is empty

src/gpu/gl/GrGLGpu.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLGpu.h"
 #include "GrGLGLSL.h"
@@ skipping 2299 matching lines @@
             bool enableSRGBWrite = GrPixelConfigIsSRGB(target->config());
             if (enableSRGBWrite && kYes_TriState != fHWSRGBFramebuffer) {
                 GL_CALL(Enable(GR_GL_FRAMEBUFFER_SRGB));
                 fHWSRGBFramebuffer = kYes_TriState;
             } else if (!enableSRGBWrite && kNo_TriState != fHWSRGBFramebuffer) {
                 GL_CALL(Disable(GR_GL_FRAMEBUFFER_SRGB));
                 fHWSRGBFramebuffer = kNo_TriState;
             }
         }
     }
+
+    // Mark any MIP chain and resolve buffer as dirty if and only if there is a non-empty bounds.
     if (nullptr == bound || !bound->isEmpty()) {
         target->flagAsNeedingResolve(bound);
-    }
-
-    GrTexture *texture = target->asTexture();
-    if (texture) {
-        texture->texturePriv().dirtyMipMaps(true);
+        if (GrTexture *texture = target->asTexture()) {
+            texture->texturePriv().dirtyMipMaps(true);
+        }
     }
 }
 
 GrGLenum gPrimitiveType2GLMode[] = {
     GR_GL_TRIANGLES,
     GR_GL_TRIANGLE_STRIP,
     GR_GL_TRIANGLE_FAN,
     GR_GL_POINTS,
     GR_GL_LINES,
     GR_GL_LINE_STRIP
@@ skipping 1371 matching lines @@
         if (GR_GL_TEXTURE_EXTERNAL == glTexture->target() ||
             GR_GL_TEXTURE_RECTANGLE == glTexture->target()) {
             copyParams->fFilter = GrTextureParams::kNone_FilterMode;
             copyParams->fWidth = texture->width();
             copyParams->fHeight = texture->height();
             return true;
         }
     }
     return false;
 }