Rebind EGL context to flush driver caches.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index dd08df8214eedc278f3173f43e2a6d03981b2d13..5cdf63163626eb7dbf06bb691d7f571169671752 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -1098,6 +1098,8 @@ class GLES2DecoderImpl : public GLES2Decoder,
 
   void DoLoseContextCHROMIUM(GLenum current, GLenum other);
 
+  void DoFlushDriverCachesCHROMIUM(void);
+
   void DoMatrixLoadfCHROMIUM(GLenum matrix_mode, const GLfloat* matrix);
   void DoMatrixLoadIdentityCHROMIUM(GLenum matrix_mode);
 
@@ -13082,6 +13084,18 @@ void GLES2DecoderImpl::DoLoseContextCHROMIUM(GLenum current, GLenum other) {
   reset_by_robustness_extension_ = true;
 }
 
+void GLES2DecoderImpl::DoFlushDriverCachesCHROMIUM(void) {
+  // Normally, we should just need to call glFinish to flush driver caches.
+  glFinish();
+
+  // On Adreno Android devices we need to use a workaround to force more caches
+  // to clear.
+  if (feature_info_->workarounds().unbind_egl_context_to_flush_driver_caches) {
+    context_->MakeCurrent(nullptr);

[piman, 2015/07/13 21:25:29]

How about context_->ReleaseCurrent() here, instead of adding logic to handle
MakeCurrent(nullptr) in other places?

[ericrk, 2015/07/13 22:11:11]

good point.

+    context_->MakeCurrent(surface_.get());
+  }
+}
+
 void GLES2DecoderImpl::DoMatrixLoadfCHROMIUM(GLenum matrix_mode,
                                              const GLfloat* matrix) {
   DCHECK(matrix_mode == GL_PATH_PROJECTION_CHROMIUM ||