Fix the size of video textures uploaded to WebGL.

media/renderers/skcanvas_video_renderer.cc

Index: media/renderers/skcanvas_video_renderer.cc
diff --git a/media/renderers/skcanvas_video_renderer.cc b/media/renderers/skcanvas_video_renderer.cc
index 707419f4bc98e03fa5abd672f2d9ffc57dab97c3..a7bf80f694ad3ca97ed42d832a17f0ee401bc9fd 100644
--- a/media/renderers/skcanvas_video_renderer.cc
+++ b/media/renderers/skcanvas_video_renderer.cc
@@ -186,9 +186,12 @@ sk_sp<SkImage> NewSkImageFromVideoFrameNative(VideoFrame* video_frame,
     gl->GenTextures(1, &source_texture);
     DCHECK(source_texture);
     gl->BindTexture(GL_TEXTURE_2D, source_texture);
+    const gfx::Size& natural_size = video_frame->natural_size();
+    gl->TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, natural_size.width(),
+                   natural_size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE,
+                   nullptr);
     SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
-        gl, video_frame, source_texture, GL_RGBA, GL_UNSIGNED_BYTE, true,
-        false);
+        gl, video_frame, source_texture, true, false);
   } else {
     gl->WaitSyncTokenCHROMIUM(mailbox_holder.sync_token.GetConstData());
     source_texture = gl->CreateAndConsumeTextureCHROMIUM(
@@ -753,8 +756,6 @@ void SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
     gpu::gles2::GLES2Interface* gl,
     VideoFrame* video_frame,
     unsigned int texture,
-    unsigned int internal_format,
-    unsigned int type,
     bool premultiply_alpha,
     bool flip_y) {
   DCHECK(video_frame);
@@ -776,8 +777,15 @@ void SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
   // value down to get the expected result.
   // "flip_y == true" means to reverse the video orientation while
   // "flip_y == false" means to keep the intrinsic orientation.
-  gl->CopyTextureCHROMIUM(source_texture, 0, texture, 0, internal_format, type,
-                          flip_y, premultiply_alpha, false);
+
+  // The video's texture might be larger than the natural size because
+  // the encoder might have had to round up to the size of a macroblock.
+  // Make sure to only copy the natural size to avoid putting garbage
+  // into the bottom of the destination texture.
+  const gfx::Size& natural_size = video_frame->natural_size();
+  gl->CopySubTextureCHROMIUM(source_texture, 0, texture, 0, 0, 0, 0, 0,
+                             natural_size.width(), natural_size.height(),
+                             flip_y, premultiply_alpha, false);
   gl->DeleteTextures(1, &source_texture);
   gl->Flush();
 
@@ -790,8 +798,6 @@ bool SkCanvasVideoRenderer::CopyVideoFrameTexturesToGLTexture(
     gpu::gles2::GLES2Interface* destination_gl,
     const scoped_refptr<VideoFrame>& video_frame,
     unsigned int texture,
-    unsigned int internal_format,
-    unsigned int type,
     bool premultiply_alpha,
     bool flip_y) {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ -828,9 +834,14 @@ bool SkCanvasVideoRenderer::CopyVideoFrameTexturesToGLTexture(
         destination_gl->CreateAndConsumeTextureCHROMIUM(
             mailbox_holder.texture_target, mailbox_holder.mailbox.name);
 
-    destination_gl->CopyTextureCHROMIUM(intermediate_texture, 0, texture, 0,
-                                        internal_format, type, flip_y,
-                                        premultiply_alpha, false);
+    // The video's texture might be larger than the natural size because
+    // the encoder might have had to round up to the size of a macroblock.
+    // Make sure to only copy the natural size to avoid putting garbage
+    // into the bottom of the destination texture.
+    const gfx::Size& natural_size = video_frame->natural_size();
+    destination_gl->CopySubTextureCHROMIUM(
+        intermediate_texture, 0, texture, 0, 0, 0, 0, 0, natural_size.width(),
+        natural_size.height(), flip_y, premultiply_alpha, false);
     destination_gl->DeleteTextures(1, &intermediate_texture);
 
     // Wait for destination context to consume mailbox before deleting it in
@@ -846,8 +857,7 @@ bool SkCanvasVideoRenderer::CopyVideoFrameTexturesToGLTexture(
     video_frame->UpdateReleaseSyncToken(&client);
   } else {
     CopyVideoFrameSingleTextureToGLTexture(destination_gl, video_frame.get(),
-                                           texture, internal_format, type,
-                                           premultiply_alpha, flip_y);
+                                           texture, premultiply_alpha, flip_y);
   }
 
   return true;