Enable 2D Canvas painting for Chrome on Android.

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 7722442b4f8d818c5a40b26b2133e025f8698a9d..c4361c179f5de0c8c9419c8f8ac5db16ff808316 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -9864,15 +9864,36 @@ void GLES2DecoderImpl::DoCopyTextureCHROMIUM(
         dest_texture, GL_TEXTURE_2D, level, true);
   }
 
-  copy_texture_CHROMIUM_->DoCopyTexture(this,
-                                        source_texture->target(),
-                                        dest_texture->target(),
-                                        source_texture->service_id(),
-                                        dest_texture->service_id(), level,
-                                        source_width, source_height,
-                                        unpack_flip_y_,
-                                        unpack_premultiply_alpha_,
-                                        unpack_unpremultiply_alpha_);
+  // GL_TEXTURE_EXTERNAL_OES texture requires apply a transform matrix
+  // before presenting.
+  if (source_texture->target() == GL_TEXTURE_EXTERNAL_OES) {
+    // TODO(hkuang): get the StreamTexture transform matrix in GPU process
+    // instead of using default matrix crbug.com/226218.
+    const GLfloat default_matrix[16] = {1.0f, 0.0f, 0.0f, 0.0f,
+                                        0.0f, 1.0f, 0.0f, 0.0f,
+                                        0.0f, 0.0f, 1.0f, 0.0f,
+                                        0.0f, 0.0f, 0.0f, 1.0f };
+    copy_texture_CHROMIUM_->DoCopyTextureWithTransform(this,
+                                          source_texture->target(),
+                                          dest_texture->target(),
+                                          source_texture->service_id(),
+                                          dest_texture->service_id(), level,
+                                          source_width, source_height,
+                                          unpack_flip_y_,
+                                          unpack_premultiply_alpha_,
+                                          unpack_unpremultiply_alpha_,
+                                          default_matrix);
+  } else {
+    copy_texture_CHROMIUM_->DoCopyTexture(this,
+                                          source_texture->target(),
+                                          dest_texture->target(),
+                                          source_texture->service_id(),
+                                          dest_texture->service_id(), level,
+                                          source_width, source_height,
+                                          unpack_flip_y_,
+                                          unpack_premultiply_alpha_,
+                                          unpack_unpremultiply_alpha_);
+  }
 }
 
 static GLenum ExtractTypeFromStorageFormat(GLenum internalformat) {